Replies

Methods

These data were produced by the bi-annual Climate Change in the American Mind survey — a nationally-representative analysis of public opinion on climate change in the United States conducted by the Yale Program on Climate Change Communication and the George Mason University Center for Climate Change Communication.

Surveys were conducted using the Ipsos KnowledgePanel®, a representative online panel of U.S. adults (18+), from November 28 to December 11, 2018. All questionnaires were self-administered by respondents in a web-based environment. This report includes the registered voters (n=966), from the full sample (n=1,114). Unweighted base sizes for the political subgroups are as follows: Democrats (n=466; liberal Democrats n=295, moderate/conservative Democrats n=168), Republicans (n=356; conservative Republicans n=238, moderate/liberal Republicans n=116), Independents (n=95).

References to Republicans and Democrats throughout include respondents who initially identify as either a Republican or Democrat, as well as those who do not initially identify as Republicans or Democrats but who say they “are closer to” one party or the other (i.e., “leaners”) in a follow-up question. The category “Independents” does not include any of these “leaners.”

Average margin of error for both the full sample and registered voter subset: +/- 3 percentage points at the 95% confidence level. The margin of error for each political subgroup is larger. Bases specified are unweighted, but percentages are weighted to align with U.S. Census parameters. For tabulation purposes, percentage points are rounded to the nearest whole number. As a result, percentages in a given chart may total slightly higher or lower than 100%. Additionally, summed response categories (e.g., “strongly support” + “somewhat support”) are rounded after sums are calculated (e.g., 1.3% + 1.3% = 2.6%, which, after rounding would appear in a chart as 1% + 1% = 3%).