Every year, the Heritage Foundation ranks countries around the world on their economic freedom. It’s a kind of capitalism index.

But analysis shows that the most economically “free” countries also register the highest scores on Yale University’s EPI environmental index, averaging 76.1, while “mostly free” countries averaged 70.2. These two groups have a significant lead over the “moderately free” countries, which received much lower ratings (59.6 points) for their environmental performance.