"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, William F.

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