Agence France-Presse: Manmade climate change is set to hasten the disintegration of a massive ice sheet in Antarctica by 100,000 years, boosting sea levels some five metres (16 feet), according to a pair of studies published Thursday. The research, which matches new ice core data with a simulation of past and future changes in the West Antarctica Ice Sheet (WAIS), reveals for the first time regular cycles of "catastrophic collapse" and reformation reaching back five million years. Cycles lasted …