Agence France-Presse: The UN Environment Programme (UNEP) said the breakway of a Jamaica-sized ice shelf from the Antarctic peninsula could accelerate global warming in this already vulnerable region. Satellite pictures show a 40-kilometre (25-mile) ice bridge that was the Wilkins Ice Shelf’s last link to the coast had now shattered at its narrowest point, about 500 metres (yards) wide, UNEP said. The Wilkins Ice Shelf once covered around 16,000 square kilometres (6,000 square miles) before it began …