Which of the following is correct regarding Arctic sea ice
A) In the summer, most sea ice melts, only to refreeze in the winter. However, less water has been refreezing over the past decade.
B) Summer sea ice reached its minimum extent in 2001 and has gradually increased since then.
C) Until recently, seasonal variations in sea ice extent were rare.
D) Since 1979, summer sea ice minimum extent and winter sea ice maximum extent have declined.
E) Maximum sea ice extent has been gradually increasing due to a positive feedback loop: more ice, more albedo=cooler temperatures, resulting in more sea ice.
D
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