Agence France-Presse: The Greenland icesheet responded to global warming over the past 10,000 years more quickly than thought, according to a study released Wednesday. As a result, a medium-sized temperature increase this century could cause the continent-sized ice block to start melting at an alarming rate, it suggests. “It is entirely possible that a future temperature increase of a few degrees Celsius in Greenland will result in a icesheet mass loss and contribution to sea level rise larger than …