The Arctic permafrost is like the world’s refrigerator, holding onto and preserving organic material. But when it thaws, as it’s increasingly doing now, microbes in the soil kick into action and produce enormous amounts of greenhouse gases.
Our daily Geo Quiz is about sand storms over the Atlantic Ocean. The question is: where does the sand come from? Anchor Marco Werman gets the answer from Eric Achterberg, a researcher who’s just back from a boat trip to study the storms. He says the sand comes from the Sahara Desert in Africa.