Agence France-Presse: The Nobel-winning panel of world climate experts gathered here Monday to hammer out a key report as a top UN official warned that political failure to fix global warming would be "criminally irresponsible." "The effects of climate change are being felt already," Yvo de Boer, executive secretary of the UN Framework Convention on Climate Change (UNFCCC), said. "Climate change will hit hardest the poorest and most vulnerable countries. Its overall effect, …