Late Holocene Climate Change: Astronomical vs. Anthropogenic Forcing

Feng He1, Stephen J Vavrus2, John E Kutzbach2 and William F Ruddiman3, (1)University of Wisconsin-Madison, Center for Climatic Research, Madison, United States, (2)University of Wisconsin-Madison, Center for Climatic Research, Nelson Institute for Environmental Studies, Madison, WI, United States, (3)University of Virginia, Environmental Sciences, Charlottesville, VA, United States