Catastrophe Author:David Keys "In effect, the mid-sixth-century climatic experience was the natural equivalent of what scientists fear would befall the world's climate in the event of nuclear war-the so-called nuclear winter. ...The mid-sixth-century climatic catastrophe displayed all the hallmarks of nuclear winter. But obviously there were no H-bombs in the firth millenni... more »um A.D. . So what was the culprit?"« less