One more time - with feeling.

http://www.bloomberg.com/news/2012-08-05/recent-heat-waves-caused-by-global-warming-hansen-says.html

"“We now know that the chances these extreme weather events would have happened naturally -- without climate change -- is negligible,” James Hansen, the top climate-change scientist at the U.S. National Aeronautics and Space Administration and the main writer of the paper, said in a statement. “The natural changes in weather from day-to-day and year-to-year” don’t explain those events. "

http://www.pbs.org/newshour/rundown/2012/08/james-hansen-extreme-heat-events-connected-to-climate-change.html

"In fact, [climate change] has now driven our climate outside the range that has existed the last 10,000 years..."


Who is this Hansen guy?
http://en.wikipedia.org/wiki/James_Hansen

Hansen is best known for his research in the field of climatology, his testimony on climate change to congressional committees in 1988 that helped raise broad awareness of global warming, and his advocacy of action to avoid dangerous climate change.