Global warming

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  • Publicado : 18 de janeiro de 2013
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I’m going to talk about global warming, which is primarily a problem of too much heat-trapping carbon dioxide (CO2), methane and nitrous oxide in the atmosphere.
Global Warming is caused by naturaland man-made causes.
Natural causes: one natural cause is a release of methane gas from arctic tundra and wetlands. Methane is a greenhouse gas. A greenhouse gas is a gas that traps heat in theearth's atmosphere. Another natural cause is that the earth goes through a cycle of climate change.
Man-made causes: pollution is one of the biggest man-made problems. The burning of fossil fuels isone thing that causes pollution. Fossil fuels are fuels made ​​from organic matter such as coal or oil. When fossil fuels are burned they give off a gas called CO2 emissions. Also mining coal and oilallows the methane to escape, because it is in the soil too.
Another major man-made cause of Global Warming is population. More people means more food, and more methods of transportation. That meansmore methane because there will be more burning of fossil fuels, and more agriculture. Have you ever been in a barn filled with animals and you smell something terrible? You're smelling methane. Anothersource of methane is manure. Because more food is needed we have to raise food. Animals like cows are a source of food which means more manure and methane. Another problem with the increasingpopulation is transportation. More people means more cars and more cars means more pollution. Also, many people have more than one car.
Since CO2 contributes to global warming, the increase in populationmakes the problem worse because we breathe out CO2. Also, the trees that convert our CO2 to oxygen are being demolished. We are not replacing the trees, so we are constantly taking advantage of ournatural resources and giving nothing back in return.
Consequences: This has been the warmest decade since 1880. Scientists say that the earth could warm by an additional 13 degrees Celsius during the...
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