POLLUTION

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POLLUTION

  1. 1. Pollution: Comprising over 70% of the Earth’s surface, water is undoubtedly the most precious natural resource that exists on our planet. Without the seemingly invaluable compound comprised of hydrogen and oxygen, life on Earth would be non-existent: it is essential for everything on our planet to grow and prosper. Although we as humans recognize this fact, we disregard it by polluting our rivers, lakes, and oceans. Subsequently, we are slowly but surely harming our planet to the point where organisms are dying at a very alarming rate. In addition to innocent organisms dying off, our drinking water has become greatly affected as is our ability to use water for recreational purposes. In order to combat water pollution, we must understand the problems and become part of the solution.
  2. 2. Causes of pollution: • Many causes of pollution including sewage and fertilizers contain nutrients such as nitrates and phosphates. In excess levels, nutrients over stimulate the growth of aquatic plants and algae. Excessive growth of these types of organisms consequently clogs our waterways, use up dissolved oxygen as they decompose, and block light to deeper waters. This, in turn, proves very harmful to aquatic organisms as it affects the respiration ability or fish and other invertebrates that reside in water. Pollution is also caused when silt and other suspended solids, such as soil, wash off plowed fields, construction and logging sites, urban areas, and eroded river banks when it rains. Under natural conditions, lakes, rivers, and other water bodies undergo Eutrophication, an aging process that slowly fills in the water body with sediment and organic matter. When these sediments enter various bodies of water, fish respiration becomes impaired, plant productivity and water depth become reduced, and aquatic organisms and their environments become suffocated.
  3. 3. • THE POLLUTION OF THE SEA from hydrocarbons (crude oil, fuel, petrol, oily waste, etc) is a global problem that entails between two and ten million tonnes of these products reaching the sea each year. Although the bulk of public attention is focused on the oil slicks caused by major oil tanker accidents, chronic dumping of these substances – in other words, the residue from ordinary maritime traffic – is three times higher. • Washing out the tanks of oil tankers, dumping bilge water and minor spillages on board or in port are the main sources of hydrocarbon pollution of marine origin.
  4. 4. • Air Pollution, addition of harmful substances to the atmosphere resulting in damage to the environment, human health, and quality of life. One of many forms of pollution, air pollution occurs inside homes, schools, and offices; in cities; across continents; and even globally. Air pollution makes people sick—it causes breathing problems and promotes cancer—and it harms plants, animals, and the ecosystems in which they live. Some air pollutants return to Earth in the form of acid rain and snow, which corrode statues and buildings, damage crops and forests, and make lakes and streams unsuitable for fish and other plant and animal life. • Pollution is changing Earth’s atmosphere so that it lets in more harmful radiation from the Sun. At the same time, our polluted atmosphere is becoming a better insulator, preventing heat from escaping back into space and leading to a rise in global average temperatures. Scientists predict that the temperature increase, referred to as global warming, will affect world food supply, alter sea level, make weather more extreme, and increase the spread of tropical diseases.
  5. 5. Look at the pollution:
  6. 6. Impacts of pollution: • Because humans are at the top of the food chain, they are particularly vulnerable to the effects of nondegradable pollutants. This was clearly illustrated in the 1950s and 1960s when residents living near Minamata Bay, Japan, developed nervous disorders, tremors, and paralysis in a mysterious epidemic. More than 400 people died before authorities discovered that a local industry had released mercury into Minamata Bay. This highly toxic element accumulated in the bodies of local fish and eventually in the bodies of people who consumed the fish. More recently research has revealed that many chemical pollutants, such as DDT and PCBs, mimic sex hormones and interfere with the human body’s reproductive and developmental functions. These substances are known as endocrine disrupters.
  7. 7. Benefits of Recycling: • Recycling creates jobs • Recycling reduces the need for landfills and incineration of solid waste • Recycling reduces the pollution caused by making products from virgin materials • Recycling saves energy • Recycling decreases emissions of greenhouse gases that contribute to climate change • Recycling conserves the natural resources such as timber, water and minerals • By conserving resources today, recycling ensures there will be plenty left for future. generations . “Recycling feels good. It's the right thing to do”
  8. 8. • Saving Energy: • It generally takes less energy to make products with recycled materials than virgin materials. It takes 20 times more energy to make aluminum from bauxite ore than using recycled aluminum. Benefits of reduced energy consumption include reduced costs and reduced dependence on foreign suppliers. • Reducing Pollution: • Using less energy also means generating less air and water pollution and recycling reduced other forms of pollution as well. Runoff from mining operations, soil erosion and toxic chemicals released when raw materials are processed.
  9. 9. Biffi –La Salle School POLLUTION Vivian Andrea López Pedraza 8B Teacher: Angie Guardo BARRANQUILLA 2009

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