Earth system models simulate Northern Hemisphere greening. The figure shows the spatial distribution of leaf area index trends (m2/m2/30yr) in the growing season (April–October) during the period of 1982–2011 in the mean of satellite observations (top), Earth system model (ESM) simulations with natural forcings alone (lower left), and ESM simulations with combined anthropogenic and natural forcings (lower right). (Image by ORNL)
A multinational team led by the U.S. Department of Energy’s Oak Ridge National Laboratory Climate Change Science Institute has found the first positive correlation between human activity and enhanced vegetation growth.
The research team, led by Jiafu Mao of the Ecosystem Simulation Science group in the Environmental Sciences Division, used new environmental data and strict statistical methods to discover a significant human-vegetation interaction in the northern extratropical latitudes, the section of the planet spanning 30 to 75 degrees north, roughly between the Tropic of Cancer and the North Frigid Zone above the Arctic Circle.
“This is the first clear evidence of a discernible human fingerprint on physiological vegetation changes at the continental scale,†Mao said. [Read more…]
