From the Archaeology News Network:
Past climate change varied remarkably between regions. This is demonstrated in a new study coordinated by the international Past Global Changes (PAGES) project, which reconstructed temperature over the past 1000 to 2000 years.
During the Little Ice Age between about AD 1250 and 1860 several cold relapses occurred, which stimulated artists to paint winter landscapes. The reproduced example was painted in 1601 by Pieter Brueghel the Younger, based on an older work by his father painted 1565 [Credit: Photo: S.U. Nussbaumer]
It is the first comprehensive temperature reconstruction on a continental scale. One of its main findings is that a general cooling trend, caused by different factors (e.g. orbital-driven insolation and changes in solar and volcanic activity), was ubiquitous across all continental-scale regions and was reversed by a distinct warm trend beginning at the end of the 19th century.
The scale of this project is impressive. Some 80 researchers from all over the world collaborated on the study, which has just been published in the scientific journal Nature Geoscience. In one of the widest-ranging efforts yet undertaken to reconstruct climate across the globe, the international author team evaluated data from all continents to track the evolution of temperatures over the past one to two millennia.