This is a new kind of satellite image of the Earth, showing nothing but vegetation. It allows us to track just how fecund the planet is — and to spot trouble regions where crop growth may soon be hindered by drought. Soon, images like these could become a crucial part of food security.
It's hard to imagine, but about 55 million years ago, Antarctica was ice-free and full of lush forests. Now analysis of ancient pollen has revealed when the last Antarctic vegetation died out...and what's next for the continents's vast ice sheets.