Resumen de Ice sheets on course for collapse
Greenland's ice sheets slid into the sea 400,000 years ago, when Earth was only a little warmer than it is today. The finding, along with data from Antarctica, suggests both of Earth's big ice sheets may have already passed a crucial tipping point, condemning them to collapse--either melting, or sliding into the ocean. Rising seas are an inevitable consequence of global warming as warmer water expands. But the big risk comes from the ice sheets of Greenland and Antarctica, which contain enough ice to force the oceans up by tens of meters if they melt completely. The Intergovernmental Panel on Climate Change has estimated that sea levels could rise by a meter this century, and that will just be the start.
