The 2012 date that gave the best support of climate change was option B. Less sea ice covered the Arctic Ocean.
Arctic sea ice is one of the most visible indicators of our changing climate.
In the Arctic Ocean, the portion covered by sea ice increases and shrinks over the course of the year. In fall, since less sunlight reaches the Arctic and air temperatures start to decrease, further sea ice forms. The overall portion covered by ice grows through the winter, usually reaching its maximum extent in early March.
In spring, as a result of more sunlight and higher temperatures, the ice begins to melt back, shrinking to its minimum extent each September.
