Methane is a natural gas that absorbs 20-30 times more infrared radiation than carbon dioxide per molecule. So as Arctic ice continues to melt because of increasing global temperatures, more methane is emitted into the atmosphere acting as a positive feedback loop for more melting.
As you may know, Arctic animals such as the polar bear have been suffering because of increasing climate and ocean temperatures. Their habitat and food supply have been heavily impacted. Is it all our fault? Well that's arguable. According to the geologic time scale, the earth was bound to warm as a natural cycle. But it was not predicted to happen so soon and so rapidly. So is that our fault? Based off our continued emissions, Yes... yes it is.
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