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70 Strategic Choices for a Turbulent World: In Pursuit of Security and Opportunity<br />
Figure 3.3<br />
Global Atmospheric Green House Gas Concentration<br />
Carbon dioxide concentration<br />
(parts per million)<br />
400<br />
350<br />
300<br />
250<br />
200<br />
150<br />
800 700 600 500 400 300 200 100 0<br />
Thousands of years ago<br />
SOURCE: Dobbins et al., 2015, Figure 6.1, based on data from Andrew Freedman,<br />
“The Last Time CO2 Was This High, Humans Didn’t Exist,” Climate Central, May 3, 2013.<br />
NOTE: Greenhouse gas concentrations are higher than they have been in nearly a<br />
million years and are rising faster than they have in the entirety of human civilization.<br />
RAND RR1631-3.3<br />
Present<br />
Start of industrial revolution<br />
First towns (Jericho)<br />
First cave paintings<br />
U.S. public opinion on climate change has shifted dramatically, 71<br />
but many Americans and some political leaders have been significantly<br />
more skeptical about climate change than other publics. 72 There is no<br />
domestic political consensus about how much, if anything, the United<br />
71 “Global Warming,” CBS News/New York Times Poll, November 18–22, 2015, p. 2. Out<br />
of 1,030 surveyed, the percentage of those saying global warming is causing an impact now<br />
rose from 35 percent in 2001 to 50 percent in 2015, while those saying it will have an effect in<br />
the future fell from 41 percent in 2001 to 25 percent in 2015. The percentage who said climate<br />
change would have no serious impact rose from 17 percent to 19 percent, while 1 percent said<br />
global warming did not exist at all. A 2016 Gallup survey found 64 percent said they worried<br />
a “great deal” or a “fair amount” about climate change, the highest level in eight years. “U.S.<br />
Concern About Global Warming at Eight-Year High,” Gallup, web page, March 16, 2016.<br />
72 The publics in the United States and the Middle East generally see the climate change<br />
issue as less serious, compared with those in Latin America, Africa, and Europe. See “Spring<br />
2015 Global Attitudes Survey,” Pew Research Center, web page, Washington, D.C., June 23,<br />
2015, questions 32, 41, and 42. Nevertheless, 66 percent of Americans surveyed by Gallup<br />
at the time of the 2015 Paris UN conference on climate change supported the United States<br />
joining an international treaty to limit greenhouse gas emissions, while only 27 percent said<br />
the United States should not join. “Global Warming,” 2015.