What global and regional emission reductions are needed to meet the EU 2°C climate target?

Meeting the EU climate policy target with more than 50% certainty implies that greenhouse gas concentrations need to stabilise at 450 (400) ppm CO2-equivalent. Global emissions need to peak around 2015, followed by substantial overall reductions by 30% (50%) compared to 1990 levels in 2050. Industrialized countries will need to reduce their emissions by 15-30% below 1990 levels in 2020. It also requires the USA to participate in significant reductions soon and major advanced developing countries within the next 10-15 years.