Work is starting in Wyoming coal country on a new type of reactor. Its main backer, Bill Gates, says he’s in it for the emissions-free electricity. Read More

Tenjen Lama Sherpa was one of the most storied mountain guides of his generation. Now, he and two of his brothers are dead, and their youngest brother must keep climbing…

Industry groups said the E.P.A. had exceeded its authority in requiring the drinking-water cleanup. The chemicals, known as PFAS, are linked to cancer and health risks. Read More

The Environmental Defense Fund, entering controversial territory, will spend millions of dollars examining the impact of reflecting sunlight into space as global warming worsens. Read More

The main things to know as voters in 27 countries head to the ballot box to shape the next five years of European Union policies. Read More

Doug Burgum, the Republican governor of North Dakota, has stepped into the spotlight as a cheerleader for oil and former President Donald J. Trump. Read More

The main things to know as voters in 27 countries head to the ballot box to shape the next five years of European Union policies. Read More

Economic growth has been ecologically costly — and so a movement in favor of ‘degrowth’ is growing. Read More

The new rule requires automakers to achieve an average of 65 miles per gallon across all models by 2031. Read More

In overheated Phoenix, firefighters are carrying giant plastic, ice-filled bags to quickly cool people, a technique pioneered in the military and at sporting events. Read More