A single glacier sitting at the bottom of the world may be all that is holding back catastrophic amounts of sea level rise. As it melts away faster than ever, scientists are racing to get a better understanding of when it might fail. Unfortunately, they’ve recently found more bad news. This Antarctic bulwark known as Thwaites, or the “Doomsday Glacier,” is gargantuan – roughly the size of Florida – and holds enough ice to push the planet’s coastlines up two feet. But the edge of Thwaites also acts as a cork, holding up the rim of the West Antarctic ice...