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0°
59°
Lonnie G. Thompson
800,000 700,000 600,000 500,000 400,000 300,000 200,000 100,000 0
Age (years BP)
CO
2 C
on
cen
tratio
n
Source: National Climatic Data Center/NOAA
300
180
200
220
240
260
280
CO
2 (
pp
m)
300
180
200
220
240
260
280
CO
2 (
pp
m)
Tem
p. in
F°
800,000 700,000 600,000 500,000 400,000 300,000 200,000 100,000 0
Source: National Climatic Data Center/NOAA
Age (years BP)
CO
2 C
on
cen
tratio
n
CO
2 (
pp
m)
400
320
340
360
380
300
180
200
220
240
260
280
Tem
p. in
F°
800,000 700,000 600,000 500,000 400,000 300,000 200,000 100,000 0
Source: National Climatic Data Center/NOAA
Age (years BP)
2008 CO2 Concentration: 387
CO
2 C
on
cen
tratio
n
400
CO
2 C
on
cen
tratio
nC
O2 (
pp
m)
320
340
360
380
300
180
200
220
240
260
280
Tem
p. in
F°
800,000 700,000 600,000 500,000 400,000 300,000 200,000 100,000 0
Age (years BP)
2008 CO2 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: NOAAPhoto: NOAA
Hurricane KatrinaHurricane KatrinaAugust 2005August 2005
HaitiHaitiSeptember 2008September 2008
Number of Major Flood Events by Continent and Decade
# o
f M
ajo
r Flo
od
s
AmericasAmericas
Source: Millennium Ecosystem Assessment
1950–1959 1960–1969 1970–1979 1980–1989 1990–2000
Photo: AP/Ajit Solanki
Ahmadabad, IndiaAhmadabad, IndiaMay 2006May 2006
AustraliaAustraliaFebruary 2009February 2009
Number of Major Wild Fires#
of
Majo
r W
ild
fire
s
1950–1959 1960–1969 1970–1979 1980–1989 1990–2000
Source: Millennium Ecosystem Assessment