Anton Mzimba, the lead ranger at a reserve in South Africa, had received multiple death threats. But he tried not to let the warnings of danger get to him, reminding himself that by protecting rhinos he was working for the greater good, according to an interview he gave last year.

“What I’m doing, I’m not doing for my own sake,” Mr. Mzimba said in the 2021 interview. “I’m doing this for the world, for my children’s children, so that one day, when I hang my boots — when I retire, when I die — they are going to enjoy the wildlife.”

WASHINGTON — President Biden on Tuesday signed a long-awaited bill meant to reduce health costs, reduce greenhouse gas emissions and raise taxes on corporations and wealthy investors, capping more than a year of on-again, off-again negotiations and cementing his early economic legacy.

“This bill is the biggest step forward on climate ever,” Mr. Biden said, after drawing a standing ovation from a White House crowd filled largely with aides and allies.

Activists are planning to drop boulders into the sea off the Cornish coast to block industrial fishing vessels from trawling the seabed, which hosts catfish, cockles and corals.

Although South West Deeps (East), 190 km southwest of Cornwall, has been designated a Marine Protected Area (MPA), fishing is still allowed because the status does not automatically prohibit it.