It also assesses the impacts of coal- and gas-fired power with carbon capture and storage (CCS). The impacts of these technologies are compared with those of modern coal and gas-fired power without CCS, but with state-of-the-art pollution control. Bioenergy is not included because it is covered in a recent IRP report (Bringezu et al., Nuclear power generation is not included because UNEP sees this technology as being under the responsibility of a different UN agency (IAEA), oil fired steam power plants were excluded because they are seen as less relevant for the future.