CNN: The news on global warming isn't getting any better. A draft summary of the next big United Nations climate study, as reported by the New York Times, concludes with nearly 100% certainty that human activity is the main cause behind the earth's heating, and that if nothing is done to reduce our greenhouse gas emissions, sea levels could rise a catastrophic three feet by the end of the century. In the 2010 Cancun Agreement, world leaders concluded that the most we can afford is a 2°C rise in global...