Attitude Strength
Research by the Political Psychology Research Group at Stanford University
Introduction Fundamentals Who Should Take Action Government Policy Economic Side Effects Willingness to Pay Priority Consequences of Global Warming Preparing for Possible Consequences Consumer Choices Attitude Strength Voter Behavior Opinions in the States Trust in Scientists Scientists' Beliefs Partisan Views Publications Lectures and Podcasts
Knowledge and Engagement
An important measure of attitude strength is knowledge. A significant portion of Americans – over half in the last decade – believed they knew at least a moderate amount on the issue of global warming. In 1997, 42% said they knew a moderate amount or a lot about the topic, compared to an all-time high of 75% in 2020 and 73% in 2024, as shown in the figure below.
The Global Warming Issue Public
For just about every policy issue, a small group of people consider it to be of great personal importance. This group of people is called the “issue public” on the issue, (1) and its size is estimated by the percentage of the American public who say the issue is extremely important to them personally. These are the people who are passionate about it, follow it closely, and actively seek out information on the issue. More importantly, the issue public is especially likely to cast votes based on the issue (a more detailed discussion can be found on the Voter Behavior page).
Personal importance appears to be the root of policy issue engagement for citizens (2) – personal importance has been shown to have much more impact than national importance on candidate choices, policy preference expression, and financial contributions to political lobbying organizations. In other words, citizens for whom an issue is highly personally important are the ones most likely to write letters to the media and to representatives expressing their views on the issue, to volunteer with organizations advocating to influence policy on the issue, and to vote in line with their views on that issue.
Over the years, the size of the global warming issue public has hovered at about 15% of the American adult population. It reached an all-time high of 26% in 2020 and 21% in 2024 (see the figure below).
Another way to assess a person’s level of engagement with an issue is to measure their strength of opinion on it.
As the graph below indicates, the percentage of Americans with very or extremely strong opinions on global warming from 2010 to 2015 has hovered at about 40-45%. In 2010, 41% of respondents reported having very or extremely strong opinions on global warming. An all-time high of 54% of respondents in 2018 and 48% in 2024 reported this intensity of opinions on global warming (see the following figure).
References
- Krosnick, Jon A. “Government policy and citizen passion: A study of issue publics in contemporary America.” Political Behavior 12.1 (1990): 59-92.
- Miller, J. M., Krosnick, J. A., & Fabrigar, L. R. (2016). The origins of policy issue salience: Personal and national importance impact on behavioral, cognitive, and emotional issue engagement. In Political Psychology: New Explorations (pp. 125-171).