Agence France-Presse: A JAMAICA-sized ice shelf is close to wrenching itself away from Antarctica, following dramatic weakening of an ice "bridge" linking it to the continent. The icy umbilical cord tying the Wilkins Ice Shelf to two islands on the Antarctic peninsula "looks set to collapse". The evidence comes from radar pictures taken by a Envisat Earth-monitoring satellite. Scientists have been keeping a worried eye on this ice shelf for years. For many, it is a barometer of global …