Greenland's ice sheet is melting. That's having a major impact on global sea levels.
A new study finds Greenland has seen its warmest temperatures in last 1,000 years, which is causing the ice sheet to melt. Here's why that matters.
A new study finds Greenland has seen its warmest temperatures in last 1,000 years, which is causing the ice sheet to melt. Here's why that matters.