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produced by rain will result in fewer pollutants and a cooler climate. Finally, trees provide shade. With more trees, areas of earth will be cooler. When there are fewer trees, the earth itself gets warmer (Stock, 2007).

 

Now, to quite simply address the important point, it is true that indigenous forests and woodlands have been reduced by at least one-fifth of their former size in the last several years. Forests presently occupy only 21% of global land mass and are continually being removed at a rate of about 12 million hectares (10,000 meters squared) per year (Collins, 2001). Trees have never before been reduced by this high amount. Back in the days of the Roman Empire, the estimated forest area was 90% of global mass (Stock, 2007). This is a major decrease in climate-regulating, carbon-reducing machinery. Is there any wonder why the earth might be slightly warmer now than before? If you have a problem with excess CO2, blame the lack of trees, not man-made machinery.

 

This problem of deforestation can be reduced. In third world countries, thousands of acres of forests and tropical woodlands are destroyed for the sake of farmland. This land has poor crop yields, leading to more forest destruction. It would be a better alternative to leave the forests alone and trade other goods for food from other countries more well-endowed with farmland (Stock, 2007).

 

Of course, this nevertheless brings up an interesting point. As already implied, during the times of the Medieval Warm period, there were more trees on the globe, and less CO2 in the atmosphere. Today, there are less trees and more CO2. The strange thing is that the facts demonstrated above by Gardiner, Brady, and Mandia show that the earth was warmer during the Medieval Warm Period than it is today. So how much is CO2 really to blame? According to the data, it has a very slight effect indeed!

 

The last cause of global warming to be discussed is radiation. It is interesting to note that, according to University of London's Phillip Stott, many eminent scientists are now giving radiation more emphasis than ever before. “There are a whole range of scientists who are working on this particular topic and they say it is one of the big unknowns (and a lot of) regular research has been done on it” (Lehrer, 2007). Daniel Botkin, scientist and biologist, discusses an exemplary illustration of radiation. He agrees with the current observation that the glacier on Mt. Kilimanjaro is melting, although it is amidst below-freezing temperatures (Botkin, 2007). What must be considered, however, is that the temperatures are not always below freezing, since the temperature of this mountain is affected by “freezing cold nights and burning sun during the day” (“Kilimanjaro”, 2007). If this ice is melting due to an excess of CO2, the temperature would have to gradually rise in a continuous trend, since it is trapping heat from the sun which also does not escape. However, this is not the case. The ice melts during the day, freezes during the night, and melts again during the day, simply due to本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。