New research finds that Arctic peatlands are expanding as the far north undergoes rapid changes. It's an ominous sign.

We’ve got an elemental tug of war, then: As the far north rapidly and radically changes, how much carbon will these expanding peatlands sequester in the Earth, but how quickly will that carbon return to the atmosphere if these new peatlands dry out and catch fire? Only time — and scientists traipsing through the Arctic — will tell.