1. Leiserowitz A., Public Perception, Opinion and Understanding of Climate Change–Current Patterns, Trends and Limitations (United Nations Development Programme, New York, 2007)http://hdr.undp.org/en/reports/global/hdr2007-2008/papers/leiserowitz_anthony.pdf.
2. Materials and methods are available as supporting material on Science Online.
3. Morgan M. G., Fischhoff B., Bostrom A., Atman C. J., Risk Communication: A Mental Models Approach (Cambridge Univ. Press, New York, 2002).
4. IPCC Climate Change 2007: The Physical Science Basis: Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change S. Solomon et al. Eds. (Cambridge Univ. Press Cambridge 2007).
5. The Climate Change Commitment