Living on a planet with a fever

April 2012 global land temperatures were the 2nd warmest on record, and the Northern Hemisphere land surface temperature was 1.74°C (3.13°F) above the 20th century average, marking the warmest April since records began in 1880. 

The CBS Evening News  had one of their best segments ever on manmade global warming.  The piece is headlined on their website, "Assessing the risk of climate change" with this description:

The past 12 months were the hottest on record, and forecasters are predicting high temperatures across the U.S. this summer. Science and environment contributor M. Sanjayan explains the risk of climate change.