The Earth Council -- a Geneva-based international NGO "civil society vehicle created to follow up, promote, and advance the implementation of the Earth Summit agreements" -- has started an online seminar entitled "The Greenhouse Effect and Climate Change." It is being taught by Sven Åke Bjørke, a lawyer, science teacher, and course designer for the UN University/Global Virtual University, and the project leader/lead author on two UNEP climate change research efforts, and more. The focus is on the scientific consensus (based on the IPCC) on global warming, but will also bring in perspectives from critics and outside researchers. It appears to be fairly introductory, but could be very interesting. Tuition is $54 now, going to up to $60 soon.
(Via SciDev.Net, which has more details)