In this bonus from Stay Tuned, climate scientist Peter Kalmus addresses international climate policy, nuclear energy, and the energy inefficiency of cryptocurrencies. 

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Stay Tuned with Preet is brought to you by CAFE and the Vox Media Podcast Network.

Executive Producer: Tamara Sepper; Senior Editorial Producer: Adam Waller; Technical Director: David Tatasciore; Audio Producer: Nat Weiner; Editorial Producers: Sam Ozer-Staton, Noa Azulai, David Kurlander.