Sen. Angus King, I-Maine, is traveling to Greenland this week to see the national security effects of climate change in the Arctic first hand.

King, who co-chairs the Senate’s Arctic Caucus, is leaving Monday for the three-day trip with Coast Guard Commandant Adm. Paul Zukunft, as well as Danish defense officials. King’s first day in Greenland will include a visit to the Jacobshavn Glacier, the country’s largest and fastest moving glacier that lost five square miles over just two days last summer.