At the bottom of a glacier in Greenland, climate scientists find troubling signs

Kulusuk, Greenland (CNN) On one of the hottest days this summer, locals in the tiny village of Kulusuk, Greenland, heard what sounded like an explosion. It turned out to be a soccer field's worth of ice breaking off a glacier more than five miles away. Greenland lost 12.5 billion tons of ice to …