Scientists say warming in Greenland in the past may have been masked by local weather variability. But not any more. Climate change is blowing that away.
The study said collapse of key ice sheets, loss of tropical coral reefs and thawing of permafrost could be triggered at 1.5 degrees Celsius of warming.
Polar ice has a story to tell. Glaciologist Martin Siegert says we're heading toward a "stupid warm" future, and it's time to get smart. He lays it all out here what's happening, what the ice is telling us, and what we need to do now.