This report recommends CO2 emissions from fossil fuels to zero by 2070 at the latest. It argues that the 2°C line can only be held if a large proportion of actors – especially the OECD countries – start reducing their emissions much earlier. In this report the WBGU outlines a dual strategy for global climate protection based on interaction between multilateralism and civil society. It argues that to achieve this, on the one hand the Paris climate agreement targeted for late 2015 should exhibit certain characteristics set out by the WBGU. In particular, a process should be agreed to ensure compliance with the 2 °C guard rail. On the other hand, the report argues, all civil-society actors should make their specific contributions towards decarbonization.