The research, published in the Geophysical Research Letters, also shows a slight increase in the annual means of global and Northern Hemisphere sea ice volumes in association with the cooling. Fahrenheit globally, 0.66 F for the Northern Hemisphere and .74 F over land. In the simulations, land use data for 1000 AD uses potential natural vegetation, made up mainly of forests, while data for the 1900 AD period uses standard current vegetation data, which is a mix of forest and croplands, taken from the Community Climate Model developed at the National Center for Atmospheric Research. The greenhouse gas levels in both simulations are in concentrations taken at pre-industrial levels. This is only an abstract.
Researchers prove past cooling trend caused by move from forests to agriculture.
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