A kauri tree preserved for 30,000 years has revealed a new explanation for how temperatures in the Northern Hemisphere spiked several degrees centigrade in just a few decades during the last global ice age.
The State of the Climate in 2015 report, led by the US National Oceanic and Atmospheric Administration, was released yesterday. Unfortunately, it paints a grim picture, write Andrew King and Sarah Perkins-Kirkpatrick.
New discoveries concerning the connection between surface and cave climate will help improve the accuracy of climate signals contained in cave formations, write Gabriel Rau, Andy Baker, Mark Cuthbert and Martin Sogaard Andersen.
Research on limestone formations in a remote Scottish cave has produced a unique 3000-year-long record of climatic variations that may have influenced the fall of the Roman Empire and the Viking Age of expansion.
Dr Markus Donat explains how warm ocean temperatures in the Atlantic and Pacific at the same time led to an extremely dry spring and the hottest summers of 1934 and 1936 during the Dust Bowl in the United States.