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 ener gy efficiency. The supply options are clean fossil fuels, safe nuclear power, centralised or decentralised renewable energy, respectively. T he scenarios provide an ''existence proof'' of greenhouse mitigation o ptions, but otherwise are very different, in terms of energy infrastru cture and presumably cost. Detailed estimates of environmental costs a nd regional setup including trade patterns have not yet been fully car ried out, and the results are thus preliminary.