Sustainable agriculture Essay Example for Free

sustainable agriculture EssayAre Organic Foods All They Are Hyped Up To Be An Overview Of The Organic Food labor Today, with chamberpotcer and obesity cases increasing quickly, spate argon turning their attention to the forages they atomic number 18 consuming. Such diets as the vegan, vegetarian, lacto-vegetarian, paleo, raw, and locavore are becoming more and more popular. The star thing these diets all have in common is the belief that constitutive(a) foods are better than established foods. Similar to customary foods, organic foods contain chemicals and unhealthful bacteria, emit more greenho role gases, and are not sustainable. The chemicals in organic foods cause harm to people and the environment. Furthermore, organic foods travel long distances, producing larger amounts of greenhouse gases and changing the nutritional content of the food. Organic foods also use more land and produces little food. Though there is much hype about have organic produce, consumers may want to weigh out their options. Most people believe organic foods are better for you and the environment because they do not use chemicals.For instance, The USDA website states that organic foods are foods that are produced without using most formal pesticides fertilizers made with synthetic substance ingredients bioengineering sewage sludge or ionizing radiation (USDA). The righteousness is organic foods claim to be chemical-free except the organic pesticides they are allowed to use are so dangerous they have been grandfathered with current regulations and are not inevitable to undergo strict modern safety tests. For example, organic farmers are allowed to use copper to treat fungal diseases on their farmland clothes.Copper is not biodegradable and stays in the soil forever and is toxic in excessive amounts to the human body (Johnston). Another example is in India, who is a large manufacturer and exporter of organic foods to the United States. It has recently been estima ted that 75% of Indias surface water is contaminated by human and agricultural wastes (Michael). Organic foods can be only if as bruising to humans and our environment. There is also debate whether ingesting slanderous chemicals, which are sprayed during conventional farming methods in order to kill other financial backing organisms, are toxic to the human body.Because organic foods do not use fungicides and such, they are also frequently contaminated with bacteria and naturally occurring toxins that are harmful for human digestion (Miller). Studies have been performed to test the harmful effects to humans from organic chemicals. A recent study released by the National Institute of Environmental wellness Sciences (NIEHS) of 110 people and 358 matched controls showed two organic pesticides commonly used today, rotenone and paraquat, are linked to the development of Parkinsons disease in humans. Use of either of these pesticides makes people 2.5 times more likely to develop Parkin sons disease. Rotenone prevents the mitochondria from making necessary energy within cells. Similarly, paraquat produces excessive harmful oxygen by-products that are harmful to cellular structures (NIH). Furthermore, A 2007 Study of Use of Products and Exposure-Related Behavior (SUPERB) surveyed 364 children between ages two and five in order to compare toxin consumption and cancer risk factors. seek found all children examined had excessive amounts of arsenic, dieldrin, DDE and dioxins, all known to cause cancer.In addition, over 95% of preschool children had unacceptable amounts of acrylamide a cooking byproduct found in potato and tortilla chips, also know to cause cancer (University of California). With so many pesticides and toxins, organic or not, proving to be harmful to the human race, it is difficult to understand what the beat out options are. Research concludes all chemicals, natural or synthetic, are damaging to the human body and the environment. So the question rema ins, is it better for people to ingest organic and synthetic chemicals or harmful bacteria and toxins?Organic foods travel long distances and may be more damaging to the earth. Rich Pirog, the associate director of the Leopold Center for Sustainable Agriculture at Iowa State University, states that food travels 1,500 miles on average from farm to consumer, giving birth to the term food miles(DeWeerdt). Priogs team concluded that conventional food distribution systems used four to 17 times more fuel and emitted five to 17 times more CO2 than the local and regional systems. However, Priog mentions that food miles are a good measure of how far food has traveled.But theyre not a very good measure of the foods environmental impact (DeWeerdt). For instance, heated greenhouse tomatoes in Britain use up to 100 times more energy than those produced in fields in Africa (Johnston). Another example is our countrys largest retailer for organic foods, Whole Foods. They actually purchase most of t heir products from China and only mention it in baseborn fine print on the back of the products. Upon choosing your produce, it is helpful to check the label to identify the food miles accumulated.Media and advertisements lead people to believe organic produce has a greater nutritional value than conventional foods. The USDA website makes no claims that organically produced food is safer or more nutritious than conventionally produced food (USDA/Miller). Likewise, the United soils Food Standards Agency reported that there is no proof organic food is more nutritious than conventionally grown varieties (Taverene). The Environmental fortress Agency (EPA) regulates the organic food industry.Their standards have recently been scrutinized for allowing minimal amounts of approved chemicals. The EPA suggests the minimal traces of dangerous chemicals found in organic or conventional foods are not harmful to humans. However, studies report children and elderly are at the greatest risk of t he damaging effects from chemicals. Charles Benbrook, previously a chief scientist for the Organic Center, states that the scoop out benefits of organic foods are for children, pregnant women, and elderly who all tend to have weakened immune systems.Furthermore, he also reports studies that have followed pesticide levels in pregnant womens blood and found their children to score four to seven percent lower on IQ tests compared to their classmates (Chang). Organic foods are a wise choice for real populations. Most people choose organic products believing they are sustainable. Organic farms yield 20-50% less produce compared to conventional farms, making organic farming a less efficient use of land. For example, organic potatoes use less in terms of fertilizer production and/or energy, but convey more fogy fuel for plowing.For example, a hectare of conventionally farmed land produces 2. 5 times more potatoes than an organic one. Subsequently, if only organic foods were available, h alf the current human population would starve to death (Taverene). Orgainc foods tend to cost more than conventional foods. Although organic food yields are less, prices are as much as triple the cost of conventional foods (Taverene). This is due to the greater amounts of labor involved with organic farming procedures. Organic farmers are also held legally responsible for cross-contamination by genetically engineered foods, which in turns raises cost of organic produce.Organic farming uses fewer chemicals, which in turn promotes greater farmland biodiversity. According to the Organic Trade Association, organic fields also require less irrigation, reduce pollutants in ground water and create richer soils that aid plant growth while reducing erosion. Organic methods also minimize pesticides that can end up in your drinking glass. The Environmental Working Group (EWG) reports various cities in the United States to have unsafe levels of tap water consistently for weeks at a time (DeWee rdt). Some studies show no benefit to people consuming organic foods.Although high doses of pesticide cause cancers and birth defects, there is no evidence proving the miniscule amounts of chemicals found in conventional foods are damaging to human health. Some studies released show cancer occurrences among farmers, who are often exposed to comparatively high levels of these chemicals, are no more frequent than in other occupations. Furthermore, during the last fifty years, during a time when synthetic chemicals became the industry standard for food production, the average life expectancy has increased by over seven years (Chang). Organic foods claim to have more nutritional content than conventional foods.However, every fruit and vegetable has differing nutritional composition, which depends on a wide variety of factors including but not limited to growing conditions and season, fertilizer administration, and means of crop protection (i. e. , herbicides, pesticides, fungicides, etc . ) Food products from animal sources also differ in nutritional contents depending on such factors as age, breed and feeding routine of the animal. Furthermore, the nutritional compositions of raw foods increase during processing, transportation, storage, and cooking before consumption (DeWeerdt).Locally grown food decreases the transportation period, resulting in less carbon emissions to the environment and less oxidization to the produce, therefore providing better nutritional content (Chang). Furthermore, organic food usually tastes better, contains no synthetic fertilizers, pesticides or herbicides, which are known to cause cancer, and are more often locally grown. Furthermore, the USDA describes organic food as, food produced by farmers who promote the use of renewable resources and the conservation of water and soil to alter the quality of the environment for future generations (USDA).Organic foods are not always better than conventional foods. It must be considered the bac teria and toxins remaining on organic produce, the environmental effects and chemical additions in order to make an adequate decision of what type of produce to purchase. After studying the USDA food pyramid logo, it is apparent that the federal government encourages consuming more fruits, vegetables, and grains without any evaluation of the current farming procedures that manufacture these foods. The food pyramid also suggests an orchard apple tree is an apple and that we should be eating more apples and less processed foods, sugars and fats. (Michael).

Academic Skills Plus Essay Example for Free

Academic Skills Plus EssayAdeuceod writes What I mean by experience lying is those books that descend from H. G. Wellss The War of the Worlds, which treats of an invasion by tentacled, blood-sucking Martians shot to Earth in metal stackisters things that could not possibly happen whereas, for me, defective fiction means plots that descend from Jules Vernes books slightly submarines and b in alloon travel and such things that in truth could happen but barely hadnt al unmatched happened when the authors wrote the books. I would place my own books in this second category no Martians. (From In other worlds, p.6)With these remarks in mind, is it usable to distinguish between cognition fiction and regretful fiction? In answering this question you might consider Le Guins suggestion that people who confabulate to their works as inquisitive fiction rather than accomplishment fiction are simply trying to protect themselves from some of the negative connotations associate d with erudition fiction (see In other worlds)? Discuss in relation to at least two works.Science fiction is often outlined as a wide literary genre related to fabricated stories. It contains many subgenres, such as space opera, cyberpunk, utopia, dystopia, alternative histories and speculative fiction. Although there are an extensive number of subgenres, some writers, as Margaret Atwood, have been trying to carve up speculative fiction from science fiction. Maybe this wideness of subgenres existing under the genre science fiction is exactly the reason why Atwood entrap interesting to present this differentiation. When we consider science fiction stories, many different things can came up to our mind, such as aliens, intergalactic travel, artificial intelligence and utopian (or dystopian) societies. Considering that, as we can notice in these examples, these topics can differ a lot from each other and it might be understandable that Atwoodwanted to tell apart (more than just de fining different subgenres) the kind of fiction related to more plausible things (things that could really happen, as she says).Definitely, speculative fiction books have a completely different scenario from cyberpunk, aliens or space opera works and this could awake a desire to disconnect them in a more significantly manner. However, it is thinkable to stick out that this distinction between science and speculative fiction is not efficacious and that there is no reason for making it, especially considering that speculative fiction is just one more subgenre of science fiction. This thesis will be supported by a number of points presented throughout this essay. Firstly, it will be argued that the subgenre speculative fiction fits perfectly into the comments and requisites related to science fiction.Secondly, it will be discussed that Atwoods definition of speculative fiction is vague and can change according to interpretation, and in any case that it can be used to define as spe culative fiction other books that she clear had classified as belonging to science fiction. Thereby, her definition can be seen as not clear, which makes it not useful at all. Finally, it will be presented that Atwood seems to reinforce this division specially because distinguishing speculative fiction from science fiction is convenient for her. There are some evidences for that, for example, Le Guin once said Atwood was trying to protect herself from negative connotations associated with science fiction. This is til now broad considering that many of her attempts to define the genre contained irony and clichs.Firstly, it will be discussed that speculative fiction fits perfectly into the definitions and requisites related to the science fiction subgenres, which makes unnecessary and not useful the distinction between them. It was stated before that science fiction has a big number of subgenres and it is clear that they differ considerably from each other. However, despite their s ingularities, all of them have one kind of cohesive element in common, which brings each subgenre to be defined as part of the genre science fiction. To define this common element noticed in all the science fiction subgenres, it is useful to consider two Suvins definitions about science fiction SF is, then, a literary genre whose necessary and sufficient conditions are the presence and interaction of estrangement and cognition,and whose main formal device is an imaginative framework alternative to the authors experimental environment (Suvin 1979, p. 7) and Science Fiction is distinguished by the narrative dominance or hegemony of a fictional novum (novelty, innovation) validated by cognitive system of logic (Suvin 1979, p. 63).Considering these two definitions, it is possible to affirm then that the necessary and sufficient conditions to identify one science fiction work are the presence of a novum and the presence of a cognitive logic, the logical consistency which makes the novu m become part of our knowledge about real things. With this in mind, we can analyse the book The Handmaids Tale from Atwood. She clearly have classified this book as not being science fiction, however, it is easy to identify the novum and also the cognitive logic in her book. The novum is represented by the whole system of political organization in the Republic of Gilead described on the book and the cognitive logic is presumptuousness by some similarities that can be noticed between our society and the society described on the book.In the same way, for the book of H. G. Wells, The War of the Worlds, we can also identify the novum, which is given by the Martians and their technology and the cognitive logic, given by the similarities existing between both societies. Thus, it can be corroborate that both books The Handmaids Tale and The War of the World belongs to the genre science fiction, contradicting Atwoods previous proposition. This proves that although Atwoods book can be cla ssified as speculative fiction, it truly belongs to science fiction, leading us to verify again that speculative fiction is just one more subgenre of science fiction. It makes clear then that the division between science and speculative fiction is not useful and not justifiable.Secondly, it will be presented that Atwoods definition of speculative fiction is imprecise and also can be used to define as speculative fiction other books that were categorised as science fiction by her. In order to illustrate these points, we will analyse Atwood (2011) definition about speculative fiction as things that really could happen but just hadnt completely happened when the authors wrote the books. This is a vague and inaccurate idea. It could encompass different definitions because the range of things that could really happen is senior high schoolly hooked of each personsbeliefs and ideas, what makes this definition extremely subjective. Also, with just a few exceptions, it is not possible to s ay for sure what is and what is not going to happen.Besides, Atwood even gives us another definition Oryx and Crake is not science fiction. Science fiction is when you have chemicals and rockets. (Watts 2003, p. 3). Considering both definitions given by her, it could be understood that she considers rockets and chemicals as things that really could not happen, as they belong to science fiction. However, it is known that rockets and chemicals are not things impossible to happen, especially because nowadays we can see some examples of them. twain definitions become contradictory then. Considering her first definition, books about this theme would be classified as speculative fiction however, she decided to use these two themes to exemplify science fiction. Atwoods definitions about speculative fiction are imprecise, therefore, what is the purpose in using an imprecise and cloudy definition? It is simply not useful to distinguish science from speculative fiction then.Thirdly, it will be presented that Atwood seems to reinforce this division specially because distinguishing speculative fiction from science fiction is convenient for her. Le Guin (2009) states that Atwood was trying to protect herself from negative connotations associated with science fiction and also from being relegated to a genre still shunned by hidebound readers, reviewers and prize-awarders. Considering Le Guins remarks, it is possible to observe that science fiction was not a literary genre with considerable prestige in the intellectual earreach. This could reduce her reputation on the high literary society. One possible reason for science fiction being underestimated is that science fiction could be related to some works produced for mass earreach like Star Trek and Dr Who and intellectuals would associate her books to these works. Then it would be interesting for her to dissociate the connection between her books and the genre science fiction once it was not so appreciated by the intelle ctual audience.And this is also noticed by considering that some of her remarks about science fiction contains irony, as she frequently uses clichs to refer about it, such as rockets, chemicals, blood-sucking Martians, talking squids in outer space, and skin-tight clothing. Thus, it is possible to verify why Atwood reinforces the division between speculative and science fiction. Andconsidering her reasons we can see that they are not justifiable and strong enough to make the distinction between speculative and science fiction useful. Finally, this essay discussed a number of points in order to support the thesis that the distinction between speculative and science fiction is not useful. Firstly, it was stated that although it may be hard-fought to define some literary genres it is noticeable that speculative fiction fits perfectly in most of definitions of science fiction, making it a subgenre only.Secondly, it was presented that Atwoods definition about speculative fiction is vagu e and could classify as speculative fiction some books that she clearly classified as science fiction. Thirdly, it was discussed that is convenient for her to divulge speculative fiction from science fiction since the genre of science fiction was not so appreciated by reviewers and prize awarders and was associated to some mass audience works. She does not want to be linked to this image so she tries to put her works under a different literary classification. This point shows us clearly that there is no consistent and general reason for her to do the distinction. In conclusion, this essay illustrated that is not useful to distinguish between science fiction and speculative fiction and the reason for this was explained by all of the arguments stated previously.ReferencesAtwood, M 1985, The Handmaids Tale, Anchor Books, New York.Atwood, M 2011, In Other Worlds SF and the Human Imagination, Doubleday.Le Guin, U 2009, The Year of the Flood by Margaret Atwood, The Guardian, 29 August. Available at http//www.theguardian.com/books/2009/aug/29/margaret-atwood-year-of-floodSuvin, D 1979, Metamorphoses Of Science Fiction, Yale University Press, New HavenWatts, P 2003, Margaret Atwood and the Hierarchy of disrespect, On Spec, vol. 15, no. 2, summer, pp. 3-5.Wells, H 1898, The War of the World, New York Review Books, New York.

Social Exclusion Deprivation

Social Exclusion DeprivationSocial Exclusion DeprivationIn recent decades, crime prevention has interpreted on increasely exclusive formsWhat is Social Exclusion?According to Vleminckx and Berghman (2001), social forcing out is a concoction (or blend) of dimensional and mutually reinforcing processes of deprivation, associated with progressive dissociation from social milieu, resulting in the isolation of individuals and groups from the mainstream of opportunities society has to offer. Mayers, et.al., (2001) defined it as an inability to exercise the social rights of citizens to a basic exemplar of living and as barriers to participation in the major social and occupational opportunities of the society. Methodologists (Atkinson et. al. 2002) use the term as shorthand for a range of concerns considered to be of the essence(p) in setting the European social agenda and in the fields that people have in mind when they talk about social rights. In contrast to poverty, which is exclus ively economical, material, or resource-based, social exclusion offers a more holistic understanding of deprivation (de Haan 1999).The risk of crime increases with social exclusion and low-pitched income people living in poorer areas tend to be more at risk than people living in more affluent areas. (Bowling, 1998). Based on Eurostat 2000 the following are the indicators of Social Exclusion Financial difficulties in the household unaffordability of some basic needs unaffordability of consumer durables disadvantageous housing conditions poor wellness life expectancy self-perceived health status Infrequent contacts with friends and relatives and dissatisfaction with work or main activity. These indicators are the main cause of crimes in the society. This drive the European authorities as well as the Americans to create preventive method in order to decrease the statistics of crimes committed.Crime rate rises during the Cultural Revolution was followed by economic crisis and great i ndividualism, which began in most advanced industrial countries before the early Seventies and then continued to rise, oftentimes at a greatly augment rate, as the economic recession began to bite. In the Eighties and Nineties, the process of social exclusion is involved. The process includes the involving of the transformation and separation of the labour markets and the rise in morphological unemployment, and the exclusion arising out from the attempts to control the crime that arises from changed circumstances and excluding nature of anti-social behaviour. The process of desegregation in the sphere of community and the sphere of work The erosion of the comprehensive world of the modernist period, involved processes of desegregation both in the sphere of community (the rise of individualism) and the sphere of work (transformation of the labour markets).As an example, from a situation where exclusion creates crimes to one where attempts at inclusion are met by violence and aggre ssion. The most prominent change during the post-War period, is the entry of women into the labour market and their participation in unrestricted life whether leisure, politics, the arts, is per haps the most profound structural change of the post-War period.Today crimes are committed as a result of exclusion. The case of violence against women is a trace example, although racist violence is a close parallel. Violence in these two examples can occur, therefore, as a result of exclusion and inclusion, and it can be caused by relative deprivation and by clashes among individuals demanding equality and others resisting them. Of course, where both relative deprivation and individualism occur together as in the macho-culture of lower class, untried trifling males when confronting the demands for equality of women, often in poorly paid yet steady employment, one would expect a particularly high rate of conflict often resulting in the preference to setting up homes separately and the p reponderance of single mothers.Because of the increasing number of crimes committed caused by the indicators mentioned above crime prevention has taken into exclusive form. The future of exclusion does not augur well. Firstly, the demand for unskilled and semi-skilled manual labour has contracted in all the countries of the First World. The globalization of nifty has meant that the factories of South East Asia can compete much more cheaply than in Europe and North America. The poor are isolated in inner-city ghettos, in orbital estates, and in ghost towns where capital originally led them, then left them stranded as it winged its track elsewhere, where labour was cheaper and expectations lower.Crime stripe MethodsThere are several inclusive and exclusive forms in preventing crime it includes 1) Situational crime prevention 2) Social crime prevention 3)Situational crime prevention target is to reduce crime by managing, designing and augmenting the physical environment by a) reduc ing the opportunity to commit crime, simply by making it harder to offend b) increasing the risk of detection if deterrence fails and c) reducing the rewards of crime. The installation of surveillance cameras in public places, controlling access to buildings, car steering locks and gun controls are examples of situational measures that design to reduce opportunities for the commission of crime. Security guards, baggage screening and surveillance cameras, are examples of situational measures aimed at increasing the risk of offenders being caught. Removing car stereos, cleaning up graffito and property marking are examples of situational measures that may reduce the rewards of crime.It has been argued that crime displacement significantly diminishes the efficacy of situational crime prevention strategies for while crime rates may decrease in the area where situational projects have been undertaken, they might increase in other areas where these measures do not appear to exist.Socia l crime preventionBy changing the social rather than the physical environment, social or community crime prevention prevents offending unlike the situational crime prevention. Interventions in this case supply tools for communities to use in an effort to minimize criminal behaviour by changing social conditions. The aim is to strengthen community bonds, increase levels of informal social control and thus stops actual or potential offenders. Social crime prevention measures could focus on making those who are in the way of offending feel more integrated into the community e.g. schemes such as youth drop in centres and activity groupsDevelopmental crime prevention both involves the early identification of potential offenders or victims and intervenes in some way to keep them from realising that potential or, works with those who have already offended or been victimized to prevent further offending or victimisation from taking place.(www.aic.gov.au). For example, at the offender lev el, prevention could take the form of early childhood intervention for those deemed to be at risk of offending. Projects in this case might attempt to improve childrens health (physical and/or mental) and educational achievement. For those who have already offended, the prevention of future iniquity could be sought through rehabilitation strategies aimed at reforming them through various treatment regimes.Victim-focussed prevention could also be centred on early intervention for those considered at risk of victimisation or take place after victimisation has occurred to prevent repeat victimisation. Thus, victim-focussed intervention might include educational campaigns warning young children about the dangers of getting into cars with strangers or self-defence courses for women. Secondly, the introduction of more and more sophisticated computer software will eliminate many lower centre of attention class jobs as well as making many lower rung professional jobs increasingly precario us.ReferenceAtkinson, T.,et.al. (2002), Social Indicators The EU and Social Inclusion, capital of the United Kingdom Oxford University Press.Bowling, B. (1998) Violent Racism Victimisation, policing and social context. Oxford Carendon Press)De Haanm A., (1999) Social Exclusion Towards a Holistic Understanding of DeprivationMayers, D. (2001), Introduction In Social Exclusion and European polity, p 1-26, Northampton, MA Edward Elgar.Preventing crime in Australia 1990 2002 a selected register of crime prevention projects http//www.aic.gov.au/research/cvp/register/def.htmlVleminckx, Koen, and Joseph, Bergman, (2001), Social Exclusion and the Welfare State An Overview of Conceptual Issues and Policy Implications. P27-46.Young, J. FROM INCLUSIVE TO EXCLUSIVE SOCIETY NIGHTMARES IN THE EUROPEAN DREAM, http//www.malcolmread.co.uk/JockYoung/inclexcl.htm

Assessing The Impact Of Over Fishing Environmental Sciences Essay

Assessing The Impact Of Over Fishing Environmental Sciences EssayNowadays the submit of leatherneck resources constantly grows. The growing demand stimulates the development of piscary and other shipboard soldier resources exploitation. However, the unreasonable use of maritime resources hobo piss the fatal damage to some ecosystems and to the global ecosystem of the world ocean. The over searching is a main concern. The United Nations Food and Agriculture Organization, or FAO, declare oneselfs the statistics about the global production from capture fisheries in the world. Within the recent two decades (starting from 1985) the reported landings of marine capture fisheries have fluctuated between 80 and 86 million tones per year (DKNVS report, 2006) However, the constantly increasing plowshare of developing countries and China leads to the progressive gain of engrossed fisheries loudness. At the same time, the oversport look for in some regions has already led to ecosyst em adulteration and some species extinction. Analytics think that at the ne best future the fish will bewilder the increasingly high-value commodity, and the global demand to the fish and marine products will continue to grow.The usage of other marine resources, like energy resources, minerals, and gene pool, also grows and can lead to overuse and ecosystem degradation, too. In the aggregate the human exploitation of the marine resources and other factors of human influence, like the water pollutions and coastal agriculture, can lead to the irreversible changes in the ecosystem of the ocean up to the total degradation. Nowadays the technological voltage of humankind doesnt have the technologies of marine ecosystem resurrection.The thesis of this paper the following the human exploitation of the marine sources has to be controlled to save overfishing and other kinds of overuse, or the ecosystem of the global ocean can be irreparably damaged.Human exploitations earth vs seaHumans are the link in the pabulum chain so the human activity has an impact on ecosystems. Even early human societies changed the surrounding ecosystems. Nowadays the growth of human people and its impact on the environment escalated the problem on the global scale. Sure, the exploitation of the land resources is more active than the exploitation of the marine sources. in that respect are many terrestrial ecosystems damaged and ruined with human factors. However, the lower speed of marine life cycle causes harder resurrection of the pelagic sources. The principal difference in the human exploitation on the land and on the sea is the following on the land the humankind rebuilt the structure of terrestrial ecosystems and replaced the wild species with the domestic species. In the sea the important species werent replaced. They became extinct and the extinction of some marine species led to the degradation of marine ecosystems. Despite the existing fisheries regulations, the last majorit y of the fish stocks end-to-end the ocean are overfished. Not only fishes but marine animals like turtles and whales and some species suffer from population reduction up to 40% comparatively to the population volume a century ago. Some popular species are almost approaching extinction, for example, blue-fin tuna.There are three types of overfishing, or three kinds of direct effect of captive overfishing. To make the maximal gain per recruit the fish should grow to the proper average size. The fishery of the smaller fish is a growth overfishing. To make full the population it is needed the proper percent of mature adults. The shortage of mature adults in the population to the lower the level of reproductive capacity is a recruitment overfishing. The change in the balance of ecosystem ca utilise by fishery and preventing the population growth is an ecosystem overfishing. All three types of overfishing have the negative impact on the ecosystem.Thus, the exploitation of marine resou rces should be more careful and reasonable because of lower temp of resurrection.Ecosystem effects of overfishingOverfishing as a treat to biodiversityThere are also some collateral effects of overfishing, and the belittle in biodiversity is one of them. The loss in biodiversity is a serious treat to the ecosystem in a whole. The cumulative loss of species-from inconspicuous worms to crowing fish-sharply reduces the ability of sea life to resist diseases, filter pollutants and rebound from stresses such as overfishing and climate change (Blankenship, 2006) The numerous studies show that higher judge of biodiversity is the coarse of health and stability of ecosystem, as well as its ability to domesticate. However, the overfishing and the tumble of some the most popular species create the trend, which can lead to the total crumple of ocean ecosystem in 2048 (Blankenship, 2006). The careful fishery way can prevent the total collapse but the strict limits and bans should be impl emented without delay.The alternations in the food chainsItalian scientist Lorenzo Camerano outlined the dilemma of double-sided regulation in 1880 year. The dilemma is following the high amount of birds can decrease the population of the insets in ecosystem, however, the event of birds can be high only on those regions were the large amount of food (mainly insects) is available. (Sheffer et al, 2005)This particular example illustrates the top-down and bottom-up mechanism of regulation in the ecosystem. The bottom-up regulation is the main mechanism of indispensable regulation and the marine ecosystems are no exception. However, the human interference is an important factor of top-down regulation, which changes the internal regulation in ecosystems including marine ones. The nature of food chain is similar in every ecosystem solar energy and inorganic compounds are transformed by autotrophs, chemotrophs and litotrophs through p hottishosynthesis and chemosynthesis to organic comp ounds. Then the organic compounds are transformed by heterotrophs into the more complex organic compounds. The predators are the highest link in the pyramid. Usually the sum of predators is regulated by the number of low-level organisms. The disappearance of predators from the food chain can lead to the unrestrained growth of low-level organisms population.The marine ecosystems have their particularised features. The role of photosynthesis isnt as significant as in terrestrial ecosystems. On the other hand, the majority of chemotrophic organisms inhabit the ocean. The primary producer in the marine ecosystem is phytoplankton and the fish is a main natural predator. Nowadays the top positions in the food web of all ecosystems are occupied with people. The overfishing, or the extinction the main natural fishing, can lead to trophic cascading effects changes in the ecosystems.The recent example of trophic cascading effects caused by overfishingThe ecosystem of Canadian East Coast, ha rdly damaged with call down overfishing, suffers from the particular changes in the ecosystem. The east coast of Newfoundland was historically known as the region of fishery. The article in the Greenpeace archive tells that in 1497 year the explorer earth-closet Cabot wrote the huge cod school virtually blocked his ship. Five centuries after the Canadian government totally banned the fishery in this region because of the collapse of ecosystem.After the decrease of large fish population following level of the food web small fishes and large invertebrates, such as northern runt and northern snow crab significantly increased the population volume. The growth on this food-web level caused the shortage on its nutritive base, large plant-eating zooplankton ( 2 mm). The decrease of zooplankton, in its turn, became the reason for phytoplankton population volume increase. The unexpected (but natural) consequence was the exponential increase in seal populations. The large fishes like cod postulate with seals in the food web for the nutrition base. The extinction of main competitor allowed growing the seal population.The economic consequences of cod overfishing were also significant. Thus, the cod stocks have started to recover in areas south of 44 degrees north. The strict bans can help to recover the cod population and to return the ecosystem to its initial state. However, other areas north of 44 degrees northwestward the cod stock failed to recover despite a nearly complete shutdown of cod fishing. The coastal communities of Newfoundland still suffer from the job loss and shinny to recover.The changes in marine ecosystem lead to the shift in commercial fishery to the low-level of food-web, smaller fishes and crabs. Nowadays the economic value of the shrimp and crab fisheries is more than the earlier value of the cod fishery.Other indirect effectsThere are also some other indirect effects of oversifishing that are non so visible, but they also contribute to the general problem.The loss of macrofauna leads to the loss of ecosystem structure and the rise of pests. Generally pests are the species detrimental to humans. In the case of extravagant marine ecosystems pests are the invasive species. With the lack of restrictive factors such species are able to congest the ecosystem and force out almost all native species declining the biodiversity. For example, European green crab, the native inhabitant of Baltic sea and the northern part of the Atlantic ocean, became the invasive specie in the seas of Australia, South Africa and South America.The ghost fishing is effect from fishing nets lost of left in the ocean by fishermen. The nets are almost invisible in the dim underwater light. They can frame for a long distance. Fishes, marine animals, sea birds and even human divers can be caught and entangled with the net. The net restrict movement and can cause the disease, starvation and suffocation. The volume of ghost fishing can hardly be evalua ted because the most victims go down the ocean bottom.Methods of overfishing preventionThe importance of fishery centering increases simultaneously with the fishery development. The most popular methods of over fishing prevention are the implementation of fishing quotas, limits and bans, the development of fishing turns instead of captive fishery, the coastal zone management and some other measures.Fishing quotas, limits and bansStudies and analyses show that in the nearest future the sustainability concerns will increase due to environmental controversy. The growing demand will require the increase of fishery but the protection of marine ecosystems will require the strict bans, limits and control. The developed countries should implement the environmental regulations and institutions first and provide the same norms to the developing countries. The use of fishoil and feashmeal should become the important issue of the national policy. For example, China bans the fishery in the Sou th China Sea for the certain stage every year. However, all the quotas and limits cause the protests and resistance from fishermen.Fishing farmsThe fishing farms are preferably new but successful kind of fish production. According to FAO statistics, the contribution of aquaculture to global supplies of fish, crustaceans and molluscs continues to grow, increasing from 3.9 percent of total production by weight in 1970 to 29.9 percent in 2002. Worldwide, the sector has grown at an average rate of 8.9 percent per year since 1970, compared with only 1.2 percent for capture fisheries and 2.8 percent for terrestrial farmed meat-production systems over the same period. (DKNVS report, 2006) the shift to the fish farming from the captive fishing is rather slow. However, the fish farming can help to protect and even prevent the extinction of marine species. Thus, last year in Australia the first land farm of southern blue-fin tuna was established. The blue-fin tuna is very popular fish becau se of its buttery meat, for this reason this species is almost collapsed. The land farm fishing is a real fishing alternative and should be developed.Coastal Zone ManagementThe Norwegian experience shows that coastal zone plans for every municipality can be very useful. These plans should designate the zones for tourism and recreation, for agriculture for certain fishery related activities and protected zones. These plans should be revised within a certain number of years according the results of activities.Other methods of fishing controlThe pelagic stocks should be protected not only from overfishing but form the pollutions and the issue of global ocean environmental protection will get wind more attention worldwide. The use of fish products in the terrestrial agriculture (like the use of fishoil as the nutritional supplement) should be reconsidered and reduced. Among the other measures of pelagic stocks protection should be the reduction and mitigation of the environmental impac ts of intensive aquaculture. At last, the global institutions worldwide should develop the programs of poverty reduction on the seaside zones. It is necessary to reduce the volume of the captive fishery, both legal and illegal, and shift the fishery to fish farming.Exploitation of other marine living resourcesThe overfishing is in the focus of this research however, it is necessary to key other kinds of marine resources exploitation. Besides the biomass resources like fish, plant and marine invertebrates, the marine resources include the raw resources (underwater deposits of oil, gas and minerals and the minerals dissolved in the sea water), the energy resources (thermal energy, cockle energy, etc), and the gene pool. The development of underwater oil deposits (offshore drilling) started in the 19s century. For more than a century it became clear that offshore drilling changes the marine ecosystems in the region. The recent misfortune on the BP oil platform in the Caribbean Sea a ttracted the attention of global publicity to the problem of offshore drilling environmental impact and renewed the hot debates regarding the issue. The oil price growth stimulates the offshore drilling development, but the environmental damage of it overweighs the profits from oil trade in the long-term perspective.The genetic likely of marine sources also attracts the attention to the marine sources. The biological and chemical diversity of the pelagic sources are well-known. Unique chemical compounds have a great potential for the cosmetic, pharmaceutics, and agrochemical industries.The global ocean also hosts more than 300,000 species of plants and animals, and the scientists claim the majority of deep-water species is still undiscovered. Thus, the gene pool of marine biomass is a field of active research. The observations in Norwegian marine industries provide the information that a relatively small number of marine plants, animals, and microbes have already yielded more than 12,000 novel chemicals. Some of the marine bioactive substances (with industrial applications as technological compounds, laboratory tools or ingredients in cosmetics) are already marketed and generate high benefits to mankind (and investors) (DKNVS report, 2006).Thus, the chemical compounds arabinosides extracted from the sponge, Tethya crypta, can be used in antiviral pharmacology and as the medicine in the acute myeloid leukemia treatment. It has a market potential up to $50 million annual sales.The further research of the marine species and their potential will lead to the additional attention to the marine resources. However, the exploitation of any marine resource can be carefully managed and controlled to prevent the collapse of ocean ecosystem.Summary and conclusionThe researches of marine resources discover new and new potential of its commercial use. The gene pool and the grade of chemical compounds in the ocean open new possibilities in pharmacology, industrial chemistr y, cosmetics, etc. Modern technologies allow the development of offshore drilling and the underwater mining. However, the overuse of these possibilities can lead to the collapse of marine ecosystem. The example of overfishing shows the possible consequences of marine sources overuse. The fishery exists as long and humankind, thus its consequences are the most obvious and significant. The overshishing causes the decrease of diversity in ecosystems, the tropic cascading effects, and even the collapse of some species. It is the treatment to overall ecological unity of the ocean.The fishery management can slowdown the ecosystem degradation and prevent the irreparable damage. The modern techniques of fishery management include fish quotas and bans, fish farming, coastal zone management and some other global management like the struggle with poverty in the coastal zones. The human factor already created the trend to the collapse of ocean ecosystem, and the immediate measurer are necessary to prevent it.

Health Benefits of Dark Chocolate

Health Benefits of Dark ChocolateNatalija MillerGet Your Daily Dose of Chocolate The Darker, The BetterIt has been reported that there be certain types of bacterium located within the human last that will actually ferment chocolate into heart-healthy, anti-inflammatory compounds. At the 247th National Meeting expo of the American Chemical Society, hosted at the Dallas Convention Center this last March, this conclusion was drawn and presented. Maria Moore who is surprisingly enough, an undergraduate student working on this look stated that two different types of microbes live within a persons stomach. There argon good ones like Bifidobacterium and lactic acid bacteria, which help to break down the chocolate, and then theres the not so gr ingest ones such as some forms of Clostridia and E. coli, which occupy been know to not only produce release, but also to potentially cause gas, bloating, diarrhea and constipation. She notes that, When you eat dark chocolate, they the good microbes grow and ferment it, producing compounds that are anti-inflammatory. These researchers from Louisiana State University, led by John Finley, Ph.D., are the first to be conducting a study about dark chocolates effects on the multiple bacteria that reside within the stomach. It was said that when the compounds are absorbed, they effectively reduce the possibility of a slice in by and by years by lessening cardiovascular tissue inflammation. By testing a total of 3 different types of cocoa powder in a mock digestive tract composed of modified test tubes used to mimic normal digestion, these researchers, subjected the non-digestible materials to anaerobic fermentation using human fecal bacteria. The main ingredient in chocolate, the thing that makes chocolate, chocolate cocoa powder, contains an abundance of polyphenolic compounds (antioxidants) catechin and epicatechin being two prominent examples and dietary fiber in a relatively small amount, both of which are poorly digested and absorbed. Finley then explained that, In our study we found that the fiber is fermented and the large polyphenolic polymers are metabolized to small molecules, which are more than easily absorbed. These smaller polymers exhibit anti-inflammatory activity. Also, polyphenols found in the stomach may be converted or transformed to reduce inflammation by joining together prebiotics and cocoa powder fiber, increasing ones overall health. Prebiotics can be defined as labyrinthine carbohydrates that cannot be down in the mouth down and digested, but the good bacteria in the stomach like to eat them. Finley then went on to say that, When you ingest prebiotics, the beneficial intestine microbial population increases and outcompetes any undesirable microbes in the gut, like those that cause stomach problems. This word ended with a note on how dark chocolate could prove to be even more beneficial if combined with things like pomegranate, acai berry or other solid fruits (Ame rican Chemical Society, 2014).As far as how this concept pertains to the things that we create talked about in shape this past year, we may need to dive a little deeper into the procedure than this article goes. Because we have notwithstanding to really learn anything about physio-chemistry which is where a vast majority of these concepts apply were going to have to talk in rather general terms. Considering the elapserence that the class is termed, General Chemistry, it would seem reasonable to do just that. First things first, we must consider a lab that was done rather betimes on in the year. While discussing solubility in class, a lab was done in which a certain solution was suspended in a test tube, combined with another solution and then heated until a solid was produced. This process formed something called a precipitate. Precipitate is define in the dictionary as, to cause (something solid) to become separated from a liquid especially by a chemical process (referring to the procedure) or merely as a a substance precipitated from a solution (the solid itself) (Merriam-Websters online dictionary, n.d.). The other concept worth taking note of is thermodynamics. We have discussed Gibbs Free Energy in class these past few weeks. This too plays a role.A. D. McNaught and A. Wilkinson, the compilers of Compendium of Chemical Terminology, 2nd ed. (the Gold Book), refer to a process called Ostwald Ripening a process in which small, solid particles in a liquid compound are taken out of solution, while the dissolved species residing on the outside of those larger particles undergo redeposition. This process is one of the key underlying contributors to digestion. Food enters the stomach which is suspended (allowing the effects of gravity) placed in a solution of hydrochloric acid, potassium chloride, and sodium chloride (gastric acid) (Stewart, 1981), heated by the body, and then, through Ostwald Ripening, the food comes out as a larger, purer/cleaner (A merican Chemical Society, 2014), precipitated substance . One of the reasons why this process goes over so smoothly is because, smaller particles have a higher surface energy, hence higher total Gibbs energy, than larger particles, giving rise to an apparent higher solubility (McNaught Wilkinson, 1997).These concepts are grievous to take note of, with respect to the article about how great dark-chocolate is for a persons overall health, because in order to understand how the chocolate is broken down and absorbed, there needs to be a foundation for how the process works in general. Understanding that the substance will dissociate in the stomach and the essentials for that operation, will open up a better foundation for someone to apprehend what the article was stating. The researchers concluded that chocolate contains two poorly digested materials. After the shortened discussion on what digestion is, it can determined that chocolate has certain substances that cannot be precipitat ed. What then does the body do with what it cannot digest, or break down? Well, the answer check to the article is that they are eaten, fermented, metabolized and then absorbed by bacteria. In the case of cocoa powder, the products of this process have anti-inflammatory properties and can reduce the risk of stroke and stomach problems (American Chemical Society, 2014).Even though all the information on digestion was not included in this article, I thought what they did include was sufficiently draw together, but in my personal opinion, to anyone who isnt already knowledgeable about the subject in at least some capacity, would walk away from the article thinking nothing more than, Sweet, dark-chocolate is good for me. I should eat more of it. While this article is not necessarily promoting such action, its not contend it either. The information, however, seems to be geared towards those who do, in fact, have an already established foundation for this type of material. I thought th at the article was very reader-friendly and tried to give anyone fishy enough to read about it a basic overview of the study, but I was ultimately left questioning more than I was before reading it.Because of what I have learned about thermodynamics, solubility and precipitation, I have to wonder a couple of things. For instance, how do good bacteria eat away the complex carbohydrates and dietary fiber and then ferment it? Is the process drastically different than digestion? What sort of heat is needed for that reaction to occur? I am concerned in how, at the end of each process both digestion and fermentation/metabolization nutrients from the substance eaten are absorbed. How is the process of events different for each reaction? I have to wonder how these compounds have anti-inflammatory properties after absorption. What do those bacterium do to the dark-chocolates components, and ultimately, why isnt the bacteria digested or fermented? Does it have to do with what reactions occ ur within the stomach? That would my best guess.These are all questions that I ask myself now because general chemistry has taught me a lot about reactions, what will react, what wont and in what capacity. Because of that, I am left wondering more about what it is exactly that is happening in my stomach, not only when I eat dark-chocolate, but any time I put food in my mouth. How does our body know how to process certain foods? This concept is very interesting, and I have general chemistry to thank for that.Works CitedAmerican Chemical Society. Press Room. (2014, March 18). The precise reason for the health benefits of dark chocolate mystery solved. Retrieved whitethorn 29, 2014, from http//www.acs.org/content/acs/en/pressroom/newsreleases/2014/march/the-precise-reason-for-the-health-benefits-of-dark-chocolate-mystery-solved.htmlMcNaught, A. D., Wilkinson, A. (1997). Ostwald ripening. Compendium of Chemical Terminology (the Gold Book). Oxford Blackwell Scientific Publications.preci pitate. n.d., In Merriam-Webster.com.Retrieved May 29, 2014, from http//www.merriam-webster.com/dictionary/precipitateStewart, P. A. (1981). Chapter 1 1.5 Other incarnate Fluids. How to understand acid-base a quantitative acid-base primer for biology and medicine. New York Elsevier.

The Significance of the Beowulf Poem :: Epic Beowulf essays

The Significance of the Beowulf Poem There are many characteristics of the Beowulf numbers that make it a significant damp of the history of literature. It is a perfect representation of how the people in eighth century England communicated, what their feelings were, and their culture. It gives us vital in impressation about Old incline societal life and about Old English politics and about many things that scholars would like to have much more information on.(Raffel ix) Another characteristic is that the Beowulf poetry was passed down orally. The poem contains aspects of Christianity what form it takes in the story. It is also sort of a history of how the English language has changed in the many years from then until now. The poem also contains many mythical references and it contains a great hero. Beowulf is considered an arti particular by many because it is the oldest of the English long poems and may have been composed more than dozen hundred years ago.(Be owulf 19) It deals with events of the early 6th century and is believed to have been composed between 700 and 750. No one knows who composed Beowulf , or why. A single multiple sclerosis (Cotton Vitellius A XV) managed to survive Henry VIIIs dissolution of the monasteries, and the destruction of their great libraries since his name is written on one of the folios, Lawrence Nowell, the sixteenth-century scholar, may have been responsible for Beowulfs preservation.(Raffel ix) An interesting fact that is unique about the poem is that it is the sole survivor of what may have been a thriving epic tradition, and it is great poetry.(Raffel ix) The poem was composed and performed orally. Old English bards, or scops, most likely began by piecing unitedly traditional short songs, called heroic lays they then gradually added to that base until the poem grew to its present size. The verse form is the standard Old English isochronic each line contains for stresses there is a strong caesura in the middle of the lines and the resultant half lines are bound together by alliteration. Although little Old English poetry survives, Beowulfs polished verse and reflective, allusive development suggest that it is part of a rich poetic tradition.

We Must Be Put To an End to Gun Control in America Essay -- Firearms W

Today in America we face many controversial problems. With exact submarine simpleness, Americans cannot feel safe, and to some the thought of not being sufficient to use a piece in self-defense is very frightening. We Americans should never hand over to be in fear of not being able to protect ourselves, especially in the comfort of our own home. How are strict gun control laws and regulations going to reach the estimated 65 million gun owners that own approximately 240 million firearms (Just Facts Gun Control)? The answer is simple, they cant. at that place must be an annihilate to gun control, its problems significantly outweigh any good intentions it has, and besides there is no doubt about it, America is a safer place when the citizens are able to own firearms.Not all Americans understand what gun control really is and the useless intentions that it imposes. Gun control consists of laws and regulations that prohibit certain people from owning a firearm and establish waitin g periods on the sales of firearms. In some instances, firearms are totally banned. There are several gun control laws around the res publica today and there are others that vary from state to state, but one of the most heard of and controversial gun control laws is the Brady Act. The Brady Act is one of the gun control laws that makes a background check which is necessary to purchase a firearm, and also establishes a waiting period of five business days beforehand the firearm can be sold (Just Facts Gun Control). Activists do a great job of portraying firearms as a very negative and frightening. There are many things that gun control activists fail to consider. Many times they do not think about how often a gun is apply in self defense. Also of the total crime that is committed with a fire... ...g Outdoor Life. November 2004. Vol 211(9) 20Gun Control Just Facts Gun Control. 30 frame in 2002. Just Facts. 25 Oct. 2004.