A “green glacier” of trees is steadily taking over native grasslands. Landowners are banding together to treat the problem with fire. A prescribed fire field training in Astoria, S.D., in 2023.Credit.

Worldwide, an estimated 440 million people were exposed to a wildfire encroaching on their home at some point between 2002 and 2021, new research shows. That's roughly equivalent to the entire ...