Daily Green: A new “death map” compiled by researchers at the University of South Carolina shows that heat waves kill more Americans than any other type of natural disaster, despite the common perception that hurricanes and tornadoes are the most dangerous weather event. Published in BioMed Central’s International Journal of Health Geographics, the map dispels common misperceptions, and though the study doesn’t deal explicitly with the threat of global warming, it is a reminder that the greatest …