Futurology

It's useful to systematically compare the quantitative impact of policies across countries. However the headline does no credit to the analysis. What matters is the fraction of emissions that are reduced, not the fraction of policies. Probably just a few big policies in a few big countries make most of the difference. Many smaller developing countries were recently obliged (by Paris NDC process) to state some kind of policies, but they are still in an early stage of the learning by doing process - which is still valuable.