From xkcd: http://www.xkcd.com/402/
The permafrost line is shifting. It may be slow by tornado-chasing standards, but it’s shifting.
A study earlier this year from Université Laval in Quebec City, Canada showed that the permafrost line has moved northward by 130 kilometers in the last 50 years. While climate change is the most probable explanation for the melting permafrost, there is not enough long-term data for scientists to confirm this.
And so the research goes on to study and better understand our ever-changing world.
Learn more about climate change in our “What will Earth’s climate be in the future?” investigation.