During the first half of July 2009, Arctic sea
ice extent declined more quickly than in 2008, but not as fast as in 2007 (National Snow and Ice Data Center: http://nsidc.org/arcticseaicenews
ice extent
declined more
quickly than in 2008, but not as fast as in 2007 (National Snow and
Ice Data Center: http://nsidc.org/arcticseaicenews
Ice Data Center: http://nsidc.org/arcticseaicenews/).
Since then, annual greenhouse gas emissions have increased steeply and some of the impacts, such as the
decline of Arctic sea
ice, have started to happen much more
quickly.