http://www.sciencedaily.com/releases/2011/12/111201174225.htm
Summary:
A drop in carbon dioxide appears to be the driving force that led to the Antarctic ice sheet's formation, according to a recent study led by scientists at Yale and Purdue universities of molecules from ancient algae found in deep-sea core samples.
Critique:
Find out more about the temperatures and what would exactly affect sheet formations and what the sheet formations would affect.
Impact:
Depending on what the sheets affect could lead to dofferent things happening. Such as animals in danger, or animals not getting food.
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