Summary of analyses of options for a low carbon economy (includes MARKAL model results by Future Energy Solutions). This report contains the results of a study, undertaken on behalf of DTI, DEFRA and the PIU, to develop a range of bottom-up estimates of carbon dioxide emissions from the UK energy sector up to 2050, and to identify the technical possibilities and costs for the abatement of these emissions. Three levels of abatement by 2050 have been considered: a 60% reduction relative to emissions in 2000 - approximating to the level considered by the Royal Commission on Environmental Pollution (RCEP 2000) - plus 45% and 70% reductions relative to 2000 levels. Marsh, G, Taylor, P, Haydock, H, Anderson, D, Leach, M (2003). Options for a Low Carbon Future. DTI Economics Paper No 4, Department of Trade and Industry.