C. Global warming
The term "global warming" refers to the rise in global temperature brought on by the growing use of fossil fuels. Since the industrial revolution, more carbon dioxide has entered the atmosphere due to fossil fuel use than would normally occur due to natural processes. The additional carbon dioxide is raising the temperature by enhancing the greenhouse effect. In addition to changing precipitation patterns and forcing animals to travel, the heat is melting glaciers and sea ice. Arctic sea ice loss is one of the most severe repercussions of global warming. Both the fall and winter had record-low sea ice extents.
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