For decades, two assumptions have been part of the scientific understanding of global warming-(1) natural forces kept Earth's climate in a warm 'interglacial' state for several millennia, and (2) humans first began to alter this state during the industrial era (the last two centuries). Both of these assumptions are flawed: natural processes have been pushing climate toward a cooler, partly glaciated state for thousands of years, and emissions of greenhouse gases from early farming held off most of this natural cooling -- From lecture notes
Ruddiman is the author of the recently published Plows, Plagues and Petroleum: How Humans Took Control of Climate and has written many articles published in Scientific American, Nature and Science magazines. He is also professor emeritus of environmental sciences at the University of Virginia. Prior to his arrival there, he was for many years a senior research scientist at the Lamont-Doherty Earth Observatory of Columbia University and a program associate with the National Science Foundation.
Nicholas R. Clifford symposium
Part of the series entitled Renewal: Perspectives and possibilities in an age of climate crisis
RealPlayer 1 mini-dv (48 min.)
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