Two independent studies show how much we need to limit warming to preserve the ice. But we’re currently headed on a very different path.

Almost every month now we get news of dramatic losses of Arctic sea ice due to human-caused warming — and last month was no exception. The ice extent in March 2018 turned out to be the second lowest for the month in the satellite record.

The best estimates are that unless we significantly reduce our emissions of planet-warming carbon dioxide, the Arctic