I'm curious as to why lots of Americans on this site do not believe in global warming.
I can't speak for everyone, but I think most people here do agree Global Warming is happening. We have been in an overall warming trend for the past 18,000 years (since the Pleistocene age). Earth has done this in every interglacial period. If climate history is any guide, Earth should continue to warm melting all the glaciers and raising sea levels, until entering yet another ice age cycle.
What's at issue is the notion that Carbon Dioxide is responsible for the warming trend noted since accurate temperature recordings began (1880). CO2 levels are the same as they were ~
Water vapor is by far the most influential greenhouse gas accounting for 95% of the greenhouse effect that keeps our planet habitable. Carbon Dioxide contributes ~3%, Other gases (Methane, N2O, etc) make up the remaining ~2%. So just how much have human generated greenhouse gases changed this mixture? Answer: 0.25% That means that 99.75% of the greenhouse effect that's so necessary to sustain our climate is due to natural causes completely out of our realm of influence.
So when we talk about manmade CO2 are only talking about the 0.25% impact we are having on the greenhouse effect. Now I have to ask, would Earth's resources be best utilized by implementing policies (like Kyoto) that would cost Trillions of Dollars/Euro's/yen when it's impact will be imperceptable? (only slowing the warming trend by ~1/20th of a degree). Or would those same Trillions be better spent on species protection, Drinking water/sanitation, global education, or free ice cream on weekends?
References: http://www.geocraft.com/WVFossils/ice_ages.html#anchor2108263
"We have to offer up scary scenarios, make simplified, dramatic statements, and make little mention of any doubts we may have. Each of us has to decide what the right balance is between being effective and being honest." - Stephen Schneider (leading advocate of the global warming theory (in interview for Discover magazine, Oct 1989)