chemicals I might have picked up from food‚ drink‚ the air I breathe‚ and the products that touch my skin—my own secret stash of compounds acquired by merely living. It includes older chemicals that I might have been exposed to decades ago‚ such as DDT and PCBs; pollutants like lead‚ mercury‚ and dioxins; newer pesticides and plastic ingredients; and the near-miraculous compounds that lurk just beneath the surface of modern life‚ making
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In the 1960s a group of scientists became concerned about the use of a pesticide called dichlorodiphenyltrichloroethane (DDT)‚ which adversely affected the eggs of some birds‚ such as eagles and falcons. In addition‚ DTT also had the potential to harm humans as the chemical could be passed throughout the food chain. After recognizing the detrimental effect of the pesticide on the birds and the potential to harm humans‚ the scientist attempted to get the chemical banned. After being denied by the
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to the evolution of plant and animal species. These environmental changes in condition may be physical- temperature‚ rainfall‚ sea level and landforms e.g. Peppered Moths chemical- water salinity‚ acidity‚ use of pesticides‚ oxygen levels e.g. DDT mosquitoes competition for resources - food‚ water‚ shelter and mates e.g. dinosaurs and mammals Evidence for evolution Palaeontology- study of fossils Fossil record of organisms illustrates a clear change from simple to very complex
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Press. Water pollution. (n.d.). Retrieved July 23‚ 2012‚ from http://www.questia.com/library/water-pollution.jsp. What is water pollution. (n.d.) Retrieved July 23‚ 2012‚ from http://www.whatiswaterpollution.org/. Whitney‚ M. T. (2007). High levels of DDT still present in fish. Retrieved from http://www.naturalnews.com/021527_DDT_water_pollution.html#ixzz21cxjIDl2.
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much of the necessary knowledge and wouldn’t have been so conscientious about how he used it). In other cases where you could say that the findings of science may have been misused‚ it’ll be either because they haven’t yet extended their research - DDT did a brilliant job of eliminating malaria‚ saving milionsof lives‚ and only later did people like Rachel Carson point out the collateral damage. And there are commercial players involved now - so that many genetically modified agricultural products
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nutrients that stimulate excessive plant and algal growth in freshwater bodies. When the plants die and decompose‚ dissolved oxygen is depleted‚ causing die-offs of fish and other species living in the water. Persistent organochlorine insecticides‚ such as DDT‚ deposited in lake sediments can bioaccumulate‚ harming the fish and birds that eat them.Human and animal fecal waste contain disease-carrying organisms such as the bacterium Escherichia coli (E. coli) and pathogens that causes cholera‚ typhoid‚ and
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Question: One day Kashif went ________ with his mother. | Answer | Is Correct? | a | | | b | | | c | | | Question: Kashif was fond of______ | Answer | Is Correct? | a | | | b | | | c | | | Question: Flies and dust carry hundreds of | Answer | Is Correct? | a | | | b | | | c | | | Question: A man was sweeping the ________ by the shop. | Answer | Is Correct? | a | | | b | | | c | | | Question: Kashif did not buy sweets from
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have shown a relatively low presence of pesticide residue in organic food compared to conventional food. For instance‚ the amount of two primary pesticides‚ DDT and LINDANE‚ is restricted to the lowest pounds per dairy (ppd). DDT residue in organic milk has a mean of 0.0217 ppd and can be as low as non-detectable. In comparison‚ the mean DDT value in conventional milk is 0.0921 ppd over four times that of organic milk (Kouba 35). Similarly‚ the average LINDANE residue in conventional milk is twice
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Future of Food Development of nitrogen based bombs during World War I led to development of nitrogen based chemical fertilizers. DDT was the hero of it’s generation. In 1970’s‚ Monsanto introduced Roundup. (herbicide) Monsanto spent $8 billion buying out seed companies. The first time Americans became aware that GMO’s were part of their everyday dietwas 2001. 80 – 90% of Americans want GMO labeled. GMO labeling is the key way we can trace health effects and get corporations
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Civilization collapses • Other examples – Mayans‚ Greeks‚ Incas‚ and Romans – Future of Easter Island depends on Rapa Nui 16 Silent Spring • Rachel Carson – Published in 1962 • Critical of DDT use – Well documented‚ but highly criticized • Environmental movement – 1970: EPA & 1st Earth Day – DDT banned in many countries in 1970s 17 Environmentalist’s Paradox • Over 40 years‚ human well-being has improved while natural ecosystems decline 1 • 4 hypotheses to explain paradox
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