Medieval warming study is blow to climate change deniers

 作者:闫时轴     |      日期:2019-03-08 13:13:02
CLIMATE change deniers have been deprived of one of their favourite arguments against human-induced global warming. During the Medieval Climate Anomaly (MCA), Europe basked in balmy weather, and some claim that whatever natural mechanism caused it is warming the world today. To find out, Valerie Trouet at the Swiss Federal Institute for Forest, Snow and Landscape Research in Birmensdorf and colleagues studied the growth rate of trees in Morocco and a stalagmite in Scotland, both dating back 1000 years, to determine rainfall levels during the MCA. They found a big difference in rainfall, and hence pressure systems,