Not to pile on to what Steve wrote, but we humans are burning fossil fuels at a rate that is changing the chemical composition of the atmosphere. Perhaps 97% of climate scientists are all conspiring to exaggerate the effects of what we're doing, but maybe not. Even Exxon Mobile, the most aggressive of science denying corporations is changing their tune. Let's not get into an endless debate, just consider what Exxon is now saying:
Exxon Mobile Climate Change Policy "There is growing recognition that addressing the risk of climate change will require significant efforts by both the developed and the developing world."
"ExxonMobil believes that it is prudent to develop and implement strategies that address the risks to society associated with increasing GHG emissions."
"At ExxonMobil, our strategy to reduce greenhouse gas (GHG) emissions focuses on increasing our own energy efficiency in the short term, implementing current proven emissions-reducing technologies in the medium term, and developing breakthrough, game-changing technologies in the long term."
"The Fourth Assessment Report (AR4) of the Intergovernmental Panel on Climate Change (IPCC 2007) provides an update of scientific understanding regarding GHG emissions, global warming and the risks of climate change, and the way changes could unfold in the future. "
