The question on why poor countries appear to be more concerned than wealthy ones is an interesting one. Indeed, environmental awareness is normally linked to levels of education or percapita income (so in any given country, pollution is a problem for the educated wealthy but less so for the illiterate poor, say). The difference here is that the same issue (climate change) will have differential effects on poor and wealthy countries. (Greg has it right). Poor countries will suffer most because of stronger negative impacts and lack of resources to adapt. Some wealthy countries, particularly those in northern latitudes, might even benefit. The first group therefore seems to be more willing to trade off growth than the second. ....this would make for an interesting research project.