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Anonymous, your post is full of claims without sources, both scientific and economic. If you really want to understand global warming, I suggest you read some of the books on the subject I have reviewed over the past ten years. I'll be glad to direct you to specific titles on that list if you are interested.
As for humans contributing a certain percentage of the greenhouse gases, I'll be glad to address the statistics if you give me sources. But it is important to realize that human contributions to CO2 represent about 20% of the current total and will grow to 50% of all atmospheric CO2. (The following numbers are from memory and may be slightly off: 275 parts per million pre-industrial revolution, 350 ppm now, projections of 500-600 ppm by the end of the century with business as usual.) That may only be 3-4% of the total of greenhouse gases in the atmosphere, but that makes it quite significant.
Consider this: without the greenhouse effect, natural and human-caused, mean global temperature would be around zero Fahrenheit. We're currently around 50 degrees warmer than that. 3-4% of that is 2 degrees. That percentage is projected to grow quite a bit. It is hardly a hoax!
If you want to get a handle on what that means in terms of human contribution to global warming and the implications of that warming, I suggest you study the Intergovernmental Panel on Climate Change reports.
As for economics, perhaps you need to read Newt Gingrich's soon to be published book, A Contract With The Earth.
Fred Bortz -- Science and technology books for young readers (www.fredbortz.com) and Science book reviews (www.scienceshelf.com)