Need some proof of climate change? Check out the graph above. NASA has released data which shows that 2010 was tied 2005 for the hottest average temperature over a year - despite a cold spell in December and strong cooling La Nina conditions in the Pacific in the second half of the year.
NASA scientists believe the immediate cause of the temperature rise is the melting of the Arctic icecap which "acts as a blanket" covering the warmer ocean below it. The average temperature in December in regions of northeast Canada were 18 degrees higher than normal in 2010.