Environmental Engineering Reference
In-Depth Information
9
(a)
7
6
5
4
3
1
0
380
(b)
360
340
320
300
280
260
1
(c)
0.8
0.6
Instrumental Records
Proxy Records
0.4
0.2
0
-0.2
-0.4
-0.6
1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
Year
fig. 4.3
One thousand years of global CO and temperature change.
(a) Estimate of past emissions. (b) CO concentration from ice-core
data. (c) Temperature relative to the
-year average from proxies
and from instrumental records to the present.
(Source: Climate change impacts on the United States, http://www.
usgcrp.gov/usgcrp/Library/nationalassessment/foundation.htm )
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