The Escalating Warnings About A.I., and the Rise of a Deadly New Street Drug

Plus, the man who went to space — and never wanted to go back. Here’s what we’re covering:Some in Silicon Valley Are Questioning the Calls for an A.I. Slowdown, by Kalley Huang and Mike IsaacE.P.A. Expected to Erase Limits on Climate Pollution From Power Plants, by Maxine JoselowA Teen Autopsy Marks the Arrival of a Deadly Drug in San Francisco, by Heather KnightToyohiro Akiyama, Japan’s Chain-Smoking ‘Space Antihero,’ Dies at 84, by Javier C. Hernández and Hisako Ueno Tune in every weekday morning, and tell us what you think at: theheadlines@nytimes.com. Subscribe today at nytimes.com/podcasts or on Apple Podcasts, Spotify and Amazon Music. You can also subscribe via your favorite podcast app here https://www.nytimes.com/activate-access/audio?source=podcatcher. For more podcasts and narrated articles, download The New York Times app at nytimes.com/app. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.