an icy retreat

http://www.realclimate.org/index.php/archives/2010/07/an-icy-retreat/#more-4469
it is clear for everyone that global warming its creating fast changes in the atmosphere, one of those changes its the one mentioned and explain in this blog which i found interesting as it explains how the amount of sea ice has been changing during years, how those it happends, the evolution of the sea ice extent, how this is a influence on the earths temperature, which its important to have a knowledge of this to imagine the consecuences in our future.