0°

59°

Lonnie G. Thompson

800,000700,000600,000500,000400,000300,000200,000100,0000 Age (years BP) CO 2 Concentration Source: National Climatic Data Center/NOAA CO 2 (ppm)

CO 2 (ppm) Temp. in F° 800,000700,000600,000500,000400,000300,000200,000100,0000 Source: National Climatic Data Center/NOAA Age (years BP) CO 2 Concentration

CO 2 (ppm) Temp. in F° 800,000700,000600,000500,000400,000300,000200,000100,0000 Source: National Climatic Data Center/NOAA Age (years BP) 2008 CO 2 Concentration: 387 CO 2 Concentration

400 CO 2 Concentration CO 2 (ppm) Temp. in F° 800,000700,000600,000500,000400,000300,000200,000100,0000 Age (years BP) CO 2 Concentration: 387 Source: National Climatic Data Center/NOAA 350

1980

2007

Photo: Katherine Cherewyk

“Warming of the climate system is unequivocal.” Intergovernmental Panel on Climate Change (IPCC) AR4, 2007 unequivocal: beyond doubt

Photo: NOAA Hurricane Katrina August 2005

Haiti September 2008

Number of Major Flood Events by Continent and Decade # of Major Floods Americas Source: Millennium Ecosystem Assessment 1950– – – – –2000

Photo: AP/Ajit Solanki Ahmadabad, India May 2006

Australia February 2009

Number of Major Wild Fires # of Major Wildfires 1950– – – – –2000 Source: Millennium Ecosystem Assessment