Scenarios for greenhouse warming mitigation

Four global scenarios of energy provision are considered, all of which have zero net emissions of greenhouse gases. The scenarios assume the same demand for energy services and a high degree of emphasis on energy efficiency. The supply options are clean fossil fuels, safe nuclear power, centralised or decentralised renewable energy, respectively. The scenarios provide an ''existence proof'' of greenhouse mitigation options, but otherwise are very different, in terms of energy infrastructure and presumably cost. Detailed estimates of environmental costs and regional setup including trade patterns have not yet been fully carried out, and the results are thus preliminary.