While this has been a snowy winter, the past 50 years have shown a trend of less overall spring snow cover in the Northern Hemisphere.
If global warming continues unabated, only 6 of the 19 previous host cities could host the Winter Games again by the 2080s.
Compared with the median ice cover from 1981-2010, 2013's Arctic sea ice loss comes out to approximately 1.74 times the land area of Texas.
Global sea level rise since 1880.
From Hurricane Sandy to record heat, here is our list of the top 10 extreme weather and climate events of 2012.
A graphical look at the way winters have changed in the United States between 1895 and 2010.
Arctic warming and loss of sea ice may be helping to drive cold air southward, into the US and Europe, according to recent studies.
Submarine and satellite data since 1980 show steady shrinking.