Union of Concerned Scientists: paper published today in the Proceedings of the National Academy of Sciences (NAS) underscores the widespread consensus among climate scientists that human activity is driving climate change. The paper will be available by the end of the day online and is available by emailing the PNAS staff. The paper, written by William Anderegg, James Prall, Jacob Harold and Stephen Schneider, surveyed the work of 1,372 climate researchers. They found that nearly all published climate scientists …