Warm periods in the 20th century are not unprecedented during the last 2,000 years
Wednesday, August 9, 2017 - 05:03
in Earth & Climate
A great deal of evidence relating to ancient climate variation is preserved in proxy data such as tree rings, lake sediments, ice cores, stalagmites, corals and historical documents, and these sources have great significance in evaluating 20th century climate warming in the context of the last two millennia.