In the episode, Carl discusses the meaning and validity of “the ecological footprint.” (Correction: I say that according to the Global Footprint Network, we were roughly “consuming” 0,7 planets in 1960. The correct number is roughly 0,4.) 

References:

• https://www.aei.org/publication/18-spectacularly-wrong-predictions-made-around-the-time-of-first-earth-day-in-1970-expect-more-this-year-3/
• http://www.myfootprint.org/
• https://www.footprintnetwork.org/resources/data/
• https://www.forbes.com/sites/bjornlomborg/2017/08/02/one-planet-is-enough/#40b59f093263
• http://ecosense.me/ecosense-wp/wp-content/uploads/2012/12/CO2-Emissions.pdf
• https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3818165/
• https://quillette.com/2018/12/03/the-one-sided-worldview-of-eco-pessimists/
• https://www.footprintnetwork.org/content/images/uploads/Part_III_Technical_Document.pdf
• https://www.umweltbundesamt.de/sites/default/files/medien/publikation/long/3489.pdf
• https://courses.aynrand.org/works/the-anti-industrial-revolution/
• http://www.juliansimon.com/writings/Ultimate_Resource/
• https://industrialprogress.com/natural-resources-and-the-environment-by-george-reisman/
• https://www.capitalism.net/Environmentalism's%20Toxicity.htm