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, even though Mockingbirds are not native to Manhattan, they are beginning to populate it. Many people speculate that this mass migration is the result of a rise in temperatures, when actually studies show that it is due to the fact that a tropical plant species considered to be delectable by the birds has spread to the Manhattan area and not by new temperatures, but by tourists and owners who liked the plant. (Botkin, 2007). The migration of mockingbirds to Manhattan apparently has little to do with temperature change.

 

The adaptability of animals is one reason animals can live in many climates worldwide. In general, animals have the incredible capability to adapt rapidly in response to their changing environment. In discussing global warming, many people target the polar bear as a species which is highly threatened under warmer temperatures. To prove the adaptability of polar bears, they actually evolved from the grizzly bear about 250,000 years ago in response to the drastic climate changes of the ice age (“Bad News Bears”, 2006). Global warming advocates maintain that polar bears are being threatened with extinction due to the changing temperatures of global warming. This, however, is just another fallacy. In reality, polar bears are increasing in number. Polar bear biologist Mitch Taylor states, 'Of the 13 populations of polar bears in Canada, 11 are stable or are increasing in number. They are not going extinct, or even appear to be affected at present.' (“Bad News Bears”, 2006). Science writer Theo Richel adds to this idea. He says that although statistics show that the current population of polar bears has recently decreased, and their number is between 22,000 and 25,000, it is also true that 500 years ago, there were only between 8,000 and 10,000 polar bears (“Bad News Bears”, 2006). Also, if we must really look at polar bears as a threatened species, we must consider all factors; not just ones that look nice on paper. One that does not commonly arise in the global warming debates is how their food supply is diminishing, not because of global warming, but because of another predator: humans. Riechholf explains that the most dangerous threat to polar bears is the fact that their main food supply, seals, are being slaughtered by the thousands by Canadians each year.

 

Economic Assessment Of Climate Policy

Often coupled with the debate of whether or not global warming is a crisis is the debate regarding the appropriate actions required to mitigate any negative effects of global warming. From the side that argues global warming is a precursor to environmental doom, immediate action in the form of public policy and environmental reform is demanded. From the side positing that global warming is not a crisis, no extreme action is necessary to sustain the welfare of our planet.

 

From an economic standpoint, it has been proven that the costs associated with attempting to reverse global warming supersede the benefits of any solution (Bast, 2007). Most of the proponents of the implementation of pub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。