Guardian: Senior doctors today published a report warning that climate change is the biggest threat to global health of the 21st century. Rising global temperatures would have a catastrophic effect on human health, the doctors said, and patterns of infection would change, with insect-borne diseases such as malaria and dengue fever spreading more easily. Heatwaves such as occurred in Europe in 2003, which caused up to 70,000 “excess” deaths, will become more common, as will hurricanes, …