Getting a handle on what the ice sheets of the world are doing is a difficult challenge: they are widely dispersed, very big, three-dimensional, and hard to monitor. In this week’s Science, 47 researchers — including Ben Smith from APL, and Ian Joughin from APL and ESS — published a study providing a consensus on how continental sea ice has been affected over the past 2 decades (hint– it has decreased). How did they do this? Check out the UW News story, or Climate Central’s coverage, or the news story in Science itself. Ian also published an accompanying review. And, you can check out the paper too!