Could a cheaper, more environmentally friendly refrigerant already exist, and could corporate lobbying be helping keep it out of American air conditioners? Why did the chemicals once hailed as safe alternatives become environmental villains, and are their replacements actually much better? Melissa and Jam follow the twisty history of Freon, ozone depletion, greenhouse gases, propane, and air-conditioning regulations to find out why choosing a refrigerant is never as simple as “this one works.” Grab your red string and conspiracy board, because the chemistry drama is heating up.

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Timestamps

00:00 — The chemistry and drama hiding inside refrigerants
02:31 — Is propane an ideal refrigerant?
05:37 — How an AC episode became an eight-hour research rabbit hole
09:57 — What makes a good—and safe—refrigerant?
11:19 — The hazardous chemicals used in early refrigeration
12:08 — The invention of Freon and chlorofluorocarbons
13:18 — How CFCs damage the ozone layer
16:40 — The Montreal Protocol and the next generation of refrigerants
18:08 — Solving ozone depletion while worsening global warming
22:24 — Why isn’t propane widely used in American air conditioners?
25:35 — How US refrigerant regulations differ from international standards
29:02 — The document requesting government protection for synthetic refrigerants
40:42 — What conspiracy theories might actually be true?
50:00 — Coming next: the surprisingly cool science of swamp coolers

References from the Episode:

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