Arctic permafrost is starting to thaw. Here's why you should care.

'We have so much fun in the boat when me and Jenny go out,' Nyzell says. Nyzell and her colleague Jenny Gåling are master's students at Stockholm University. They're here in Abisko, Sweden, to study Arctic permafrost — soil that's been frozen year-round for at least two years — and the gases that seep out into the atmosphere when it thaws.