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An aging tree's girth is good for the planet, scientists say, because it helps it suck more carbon dioxide out of the air. "It's as if, on your favorite sports team, you find out the star players are a bunch of 90-year-olds," one ecologist says.

After four decades on Capitol Hill, the California Democrat plans to step down at the end of the year. He leaves a deep legacy in health and environmental law, including clean-air rules and tobacco restrictions.

In a speech that sounded at times like an airing of economic grievances, the president told APEC member nations that the U.S. will no longer tolerate unfair trade practices.

The extreme warming trend continues, and scientists fear that floating sea ice will be gone by midcentury. That will have extraordinary effects closer to home.

Seeking to cut greenhouse gas emissions dramatically by 2030, regulators approved a plan that offers incentives for truck and bus fleets to go green and for utilities to use more renewable energy.

As state-run TV cheers Vladimir Putin, cable providers have dropped Russia's last independent channel. NPR's Scott Simon interviews the editor of Dozhd TV about its struggles to stay on the air.

A new documentary charts the attempts of a trio of American climbers to be the first to scale Meru Peak, a 21,000-foot Himalayan peak. Critic David Edelstein says Meru is "cunning" — and terrifying.

The U.S. and other countries are restricting flights over eastern Ukraine after a MH17 jet was shot down. But experts agree that the airline had every reason to believe its aircraft would be safe.

Gen. Philip Breedlove, NATO's supreme allied commander of Europe, tells NPR that "hundreds and hundreds" of Russian troops as assisting separatists in eastern Ukraine.

The Air Force colonel was among the first group selected by NASA to train for the space shuttle program. He went on to fly four missions, two as commander.