One of the most significant efforts to study changes in the climate has been taking place near the top of the world. It’s a place called Petermann Glacier in Greenland, one of the largest glaciers in the Arctic Circle and a glacier that has experienced dramatic melting. It is a harsh and dangerous environment, and it has drawn some of the world’s leading climate scientists who are only able to work there a little over a month a year. We wanted to see how that work is proceeding, how they are able to move equipment and people in such a hostile place and what they’ve discovered so far — so we went to the top of the world to find out.

Sharyn Alfonsi reports from the top of the world on one of the most significant efforts to study climate change happening today

The following is a script from “Greenland” which aired on Jan. 31, 2016. Sharyn Alfonsi is the correspondent. Daniel Ruetenik, producer.