To assess the impact of Live Earth on American public opinion, Yale University, Gallup, and the
ClearVision Institute conducted two nationally representative surveys in the United States. The first
survey was conducted one week prior to Live Earth, and measured American global warming beliefs,
attitudes, preferences, and behaviors. Using the same questionnaire, the second survey was
conducted two weeks after Live Earth. The results of the two national surveys were compared to
determine whether American opinion as a whole had shifted. Additionally, the second survey asked
if respondents had tuned in to Live Earth. Subsequent analysis was thus able to compare the global
warming beliefs, attitudes, preferences, and behaviors of Live Earth “watchers” vs. “non-watchers.”
Survey 1 was conducted June 25-28, 2007, one week prior to Live Earth, using telephone interviews
with 1,014 adults, aged 18+. Respondents were drawn from Gallup's household panel, which was
originally recruited through random selection methods. The CASRO response rate was 42%. The
final sample was weighted to be representative of U.S. adults nationwide. For results based on the
total sample, one can say with 95% confidence that the margin of sampling error is ±4 percentage
points.
Survey 2 was conducted July 23-26, 2007, two weeks after Live Earth, using telephone interviews
with 1,011 adults, aged 18+. Respondents were drawn from Gallup's household panel, which was
originally recruited through random selection methods. The CASRO response rate was 40%. The
final sample was weighted to be representative of U.S. adults nationwide. For results based on the
total sample, one can say with 95% confidence that the margin of sampling error is ±4 percentage
points