The level of methane?one of the most dangerous greenhouse gases?rose last year, after being stable for a decade, and researchers now think these emissions are coming from wetlands around the melting Arctic region. A Canadian expedition to the Arctic has found "vast cracks," stretching for over 10 miles, in the ice cap there.
In BBC News, David Shukman quotes Canadian expedition member Derek Mueller as saying, "I was astonished to see these new cracks. It means the ice shelf is disintegrating, the pieces are pinned together like a jigsaw but could float away."
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