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 Isaac E.P.A. Expected to Erase Limits on Climate Pollution From Power Plants, by Maxine Joselow A Teen Autopsy Marks the Arrival of a Deadly Drug in San Francisco, by Heather Knight Toyohiro Akiyama, Japan’s Chain-Smoking ‘Space Antihero,’ Dies at 84, by Javier C.