An analysis of 1500 climate policies in 41 countries has found that a slim minority have led to a significant reduction in carbon emissions, with most policies being too specifically targeted to make a substantial difference
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.
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.