Recently I got into 2 discussions about global warming here on google plus. I am a skeptic and I am not convinced (by science) that there is any significant human made global warming that people should be worried about. I just found a really nice report [1] by William Happer, a physicist from Princeton [2], that I fully agree with. Citing just the conclusion (you can read the whole thing at [1] for more details, for example why 97% of "climate scientists" supposedly believe in global warming and other interesting things):

Let me summarize how the key issues appear to me, a working scientist
with a better background than most in the physics of climate. CO2 really
is a greenhouse gas and, other things being equal, adding CO2 to the
atmosphere by burning coal, oil, and natural gas will modestly increase
the surface temperature of the earth. Other things being equal, doubling
the CO2 concentration, from our current 390 ppm to 780 ppm will directly
cause about one degree Celsius warming. At the current rate of CO2
increase in the atmosphere —about 2 ppm per year— it would take
about 195 years to achieve this doubling. The combination of a slightly
warmer earth and more CO2 will greatly increase the production of
food, wood, fiber, and other products by green plants, so the increased
CO2 will be good for the planet, and will easily outweigh any negative
effects. Supposed calamities like the accelerated rise of sea level, ocean
acidification, more extreme climate, tropical diseases near the poles, etc.
are greatly exaggerated.
[1] http://www.thegwpf.org/images/stories/gwpf-reports/happer-the_truth_about_greenhouse_gases.pdf

[2] http://www.princeton.edu/physics/people/faculty/william-happer/
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