On Friday, November 17, 2023, the Earth appeared to have crossed a threshold into new climatic territory. That day was the first that the average air temperature near the surface of the Earth was 2 degrees Celsius warmer than preindustrial levels. Saturday was the second.The planet has been this hot before, but never in the era relevant to modern humanity.

This is an edition of The Atlantic Daily, a newsletter that guides you through the biggest stories of the day, helps you discover new ideas, and recommends the best in culture. Sign up for it here.I spoke with my colleagues Karen Hao and Charlie Warzel this afternoon about the tensions at the heart of the AI community, and how Sam Altman’s firing may ironically entrench the power of a tech giant.

In 2021, Simone Biles and Naomi Osaka, two of the world’s most highly lauded athletes, walked away from major competitions to protect their mental health. In a field that elevates “toughness” and “grit,” both drew major attention for candidly prioritizing wellness above achievement.

Donald Trump is an old man.He’s 77 years old. When Trump was born, Harry S. Truman was president and Perry Como topped the year’s pop charts. Betty White hadn’t yet started her career in film. Israel and Pakistan didn’t exist. Korea was a unified country, and Vietnam was not. The pioneering computer ENIAC was just four months old.Trump’s cultural references are dated, and only getting more so. Elton John and the Rolling Stones headline his rally playlists.

Not long ago, the idea that a former president—or major-party presidential nominee—would face serious legal jeopardy was nearly unthinkable. Today, merely keeping track of the many cases against Donald Trump requires a law degree, a great deal of attention, or both.In all, Trump faces 91 felony counts across two state courts and two different federal districts, any of which could potentially produce a prison sentence.