Global Warming is Unstoppable and Humans are to Blame, says UN Report

The long awaited report by a United Nations group of international scientists confirms that the consequences of global warming are no longer avoidable and that human activity has been the primary cause of rapid global warming for more than half a century. This Q&A-style article answers some of the most immediate questions about the report's conclusions and what must be done--and soon--to lessen the impacts of global warming. Learn more about the link between human activity and global warming.

_{Photo courtesy of NASA}