Developed countries have yet to show a serious commitment to making the required reductions in greenhouse gas emissions. Emissions reductions in developing countries, especially those with large national emissions, particularly China and India, are also critical for an effective international agreement. Both India and China, however, have per capita emissions and incomes that are much less than US levels, and are therefore unlikely to be willing to commit to emission reductions until the developed countries are clearly committed to and have begun taking serious measures to reduce greenhouse gas emissions. Developing countries are skeptical, given the lack of evidence of zero-carbon economies, that emissions reductions of the necessary globa...