Policies everywhere have become stricter since 1990. More importantly, the new study confirms earlier findings about the impact of individual measures: “an increase in stringency of environmental policies does not harm productivity growth.” This contradicts what most governments and companies seem to believe: that green rules may be justified by the need to save the planet but impose immediate economic costs. […] [The study] reckons that a shift from the lowest (Greek) levels of environmental stringency to the highest (Danish) ones further boosts productivity in the most productive manufacturing firms by 0.2-0.6%. But it reduces productivity, by 0.1-0.3%, in firms that were already less productive.
OECD study of environmental regulations (Economist)