100~~

2(2010-8-31)

(2010-8-9)

2010

4yr3yr

2020

21001

http://pubs.usgs.gov/factsheet/fs50-98/

(KM3)(M)26,039,20064.83,262,0008.1227,1000.52,620,0006.6180,0000.532,328,30080.3

86

Observed and modeled Arctic sea-ice extent2020-2037

2008/7/28

0 M3 M5 M10 M

0 M3 M5 M10 M

2009/8/9 2010/10/22

- -

********FAQ 2.1, Figure 1. Atmospheric concentrations of important long-lived greenhouse gases over the last 2,000 years. Increases since about 1750 are attributed to human activities in the industrial era. Concentration units are parts per million (ppm) or parts per billion (ppb), indicating the number of molecules of the greenhouse gas per million or billion air molecules, respectively, in an atmospheric sample. (Data combined and simplified from Chapters 6 and 2 of this report.)

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