Reuters: The world will face a “global health catastrophe” if governments fail to agree deep cuts in greenhouse gas emissions as part of a U.N. pact in Copenhagen in December, several leading doctors have declared. “What’s good for the climate is good for health,” according to an editorial published in the British Medical Journal and The Lancet on Wednesday. A strong agreement in Copenhagen by 190 nations to curb emissions would help avert heatwaves, floods and desertification that …