2,000 Years of Climate

More than 80 scientists from 24 countries analyzed data from tree rings, ice cores, historical documents, and other sources to create a chronological picture of Earth's climate over the last 2,000 years. Among other things, they concluded that our planet has not seen the likes of the current warming trend for 1,400 years and that the Medieval warming period was probably not a global phenomenon: http://www.scienceworldreport.com/articles/6387/20130422/new-evidence-climate-change-earths-current-warming-seen-1400-years.htm