It’s easy to assume people in “red” and “blue” states have very different ideologies regarding climate change. An analysis of surveys measuring Americans’ opinions about global warming-related issues tells a different story.

Jon Krosnick, a senior fellow with the Stanford Woods Institute for the Environment, presented the findings from his work with Stanford University Visiting Scholar Bo MacInnis this morning to the congressional Bicameral Task Force on Climate Change in Washington, D.C.

Majorities of residents in every state surveyed said the government should limit greenhouse gas emissions by businesses and, in particular, by power plants, Krosnick said. Majorities also favored a cap-and-trade system to limit emissions; tax breaks to encourage the production of energy from the sun, wind and water; carbon sequestration; and government regulations or tax breaks to require or encourage improvements in the energy efficiency of automobiles, appliances and buildings. No state had a majority of residents opposed to any of those policies.

Percentage of Americans Who Believe Global Warming Has Been Happening

“The consistency of findings across states was surprising to me,” said Krosnick, a professor of communication, political science, and psychology at Stanford University. “I have often heard legislators in Washington express the belief that there is considerable variation in opinions about global warming across parts of the country, and that most of the people living in their state or district are skeptical about global warming.

“When I ask about the polling they have done that led them to this belief, I have routinely been told that they had not done polling and, instead, base their impressions on phone calls, emails and conversations with and from constituents on the issue. Our findings suggest that the balance of those direct communications from constituents to elected representatives may have created a misimpression of the public’s opinions on the issue.”

MacInnis and Krosnick reached these conclusions by conducting what social scientists call a “secondary analysis” of existing data from national surveys that measured public opinion in nearly every state on various issues related to global warming. He added data collected in surveys of representative samples of residents in a collection of states. The 21 surveys analyzed (mostly by Stanford) were primarily conducted between 2006 and 2013. Data from 19,751 respondents were analyzed. Four states had insufficient data: Alaska, Hawaii, North Dakota and Wyoming.

The statistical modeling procedure estimated differences in opinions between states while taking into account the effects of each survey mode (e.g., telephone interviewing vs. self-completion of Internet questionnaires) on expressed opinions, differences between results obtained by different data collection firms and sponsored by different organizations, the effects of the season when the survey took place, and other factors. The result of the statistical modeling were measurements of opinions in each state in 2012-13 gauged via random-digit-dialed telephone surveys sponsored by Stanford.

Findings from MacInnis and Krosnick’s analysis include:

• In the states examined, majorities consistently said the U.S. should take action to limit its emissions regardless of what other nations do.
• Majorities in nearly all states endorsed having the federal government do more than it is doing now to deal with global warming. Exceptions were Idaho (45 percent endorsed doing more), Montana (48 percent), Nevada (47 percent) and Utah (46 percent).
• In no state did even a near-majority endorse increasing consumption taxes levied on gasoline or electricity use.
• In only one state did a clear majority endorse giving government tax breaks to encourage building of more nuclear plants: South Carolina, where 64 percent favored that action. Bare majorities endorsed tax breaks to encourage construction of nuclear plants in Connecticut (52 percent), Minnesota (53 percent) and Louisiana (50 percent).
• Support for government efforts to encourage building of all-electric cars was notably lower than other policy approaches. The largest endorsement came from the states of Washington, New Jersey, Iowa and Kansas, which all favored the proposal by 68 percent.
• Engagement in global warming was consistent across states. In most states, between 50 and 70 percent of those surveyed said they were highly knowledgeable about the issue. The lowest self-reported knowledge levels were observed in Alabama (38 percent) and West Virginia (29 percent).

Maps and fact sheets showing Americans’ opinions, state by state, on various climate questions (created by the Stanford Geospatial Center).