Arctic conditions may become critical for polar bears by end of 21st century

26 noviembre 2014

Shifts in the timing and duration of ice cover, especially the possible lengthening of ice-free periods, may impact polar bears under projected warming before the end of the 21st century, experts say.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/MquKFTIh70E/141126144235.htm