“Negative emissions”: the next challenge for climate policy

If the Paris climate objectives are upheld, policymakers will soon be facing calls to set emission-reduction targets of much more than 100 percent, write Oliver Geden of the German Institute for International and Security Affairs (SWP) in Berlin and Stefan Schäfer of the Institute for Advanced Sustainability Studies (IASS) in Potsdam. But the debate about how to achieve “negative emissions” – and who will have to achieve them – has not even begun, they note.