The Sacramento Mountains checkerspot butterfly is critically endangered, with the last known larva living in a lab in New Mexico.
As many as 25,000 free-ranging dogs roam the cold, high-altitude desert of Ladakh, India. That’s a problem for wildlife and people alike.
The president exempted a copper smelter in Arizona from air-quality rules. An E.P.A. official guided the company that sought the exemption, emails show.