After a judge issued a tentative ruling on a legal challenge Tuesday, the Catalina Island Conservancy said that it would begin the first phase of its plan to kill nearly all of the 2,000 deer on the California island.

© Sinna Nasseri for The New York Times

Rising sea temperatures mean reefs don’t have enough time to bounce back between intense heat waves, a new report warns.

© Jason Gulley for The New York Times

A trek in a remote corner of the Iberian Peninsula brought a writer face-to-face with ancient oaks, rewilding efforts and prehistoric cave art.