Global Climate Change Overview. Michael D. Mastrandrea, Ph.D. Deputy Director, Science, IPCC Working Group II and Assistant Consulting Professor Woods Institute for the Environment. The Key Facts. Global climate change is… unequivocal , almost certainly caused mostly by us ,
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Michael D. Mastrandrea, Ph.D.
Deputy Director, Science, IPCC Working Group II
Assistant Consulting Professor
Woods Institute for the Environment
Global climate change is…
Average Surface T in 2001-2005 vs 1951-80
J. Hansen et al., PNAS 103: 14288-293 ( 2006)
Muir Glacier, Alaska
NSIDC/WDC for Glaciology, Boulder, compiler. 2002, updated 2006. Online glacier photograph database. Boulder, CO: National Snow and Ice Data Center.
Source: ACIA, 2004, CIRES, 2005, Roger Braithwaite, University of Manchester (UK)
Major floods per decade, 1950-2000
Western US area burned
Source: Westerling et al. 2006
emissions frommarine systems100 Gt C per year
750 Gt C
379 ppm CO2
emissions fromterrestrial systems 100 Gt C per year
absorption bymarine systems102 Gt C per year
absorption byterrestrial systems103 Gt C per year
9 Gt C per year
Source: Hansen, Clim.
Change, 68, 269, 2005.
Black = Observed
Gold = Human and Natural Forcings
Blue = Only Natural Forcings
Percentage Remaining, Relative to 1961-1990
Rapidly Increasing Emissions
Raupach et al. 2007, PNAS
Raupach et al., 2007