All episodes

18. Wastewater Treatment Plants

17. Vanilla

Bonus: Queen Methane Emissions

16. Fast Fashion

15. Pellagra

14. Megacities

13. Wild Salmon

Bonus: Chariot of Chameleons

12. Rethinking Climate Change

11. Gypsy Moths

10. United Nations Environment Programme

9. Asthma

Bonus: Socks, Sandals, and Barbecue Fires

8. Natural Gas Compressor Stations

7. Earthquakes

6. Rare Earth Minerals

5. Beef

Bonus: Plankton Buys a Glowstick

4. Lead Paint

3. Yosemite National Park

2. Lawn Pesticides

1. Traffic