Today on Uncommon Knowledge, Steven Hayward, author of the annual Index of Leading Environmental Indicators, on the “Environmental Kuznets Curve.” The what?

You’ll have to watch to get a full explanation, but here’s a hint:

If you take the World Bank’s list of the worst air polluted cities in the world, not a single American or European city cracks the top 50.

For Steve Hayward in full, click here.