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A Beijing artist who collected a jar of air from Provence, France, sold it at auction "to question China's foul air and express dissatisfaction."

A revelation goes against widely held ideas about how some glaciers work, and it suggests that at least parts of Greenland's ice sheet survived periods of global warming intact.

Nearly half the horn players in an Australian study noticed that they'd lost some of their hearing. Among the younger horn players, hearing tests found that up to one-third of them had noise-related hearing deficits.

President Obama has been able to fill one opening on a key appeals court, but three more remain. And GOP senators are signaling that they'll block those remaining nominations, saying the D.C. Circuit Court of Appeals doesn't really need that many judges.

Urban farmers are eyeing rooftops that are already green as potential sites to grow food. But there are big obstacles to rooftop farming — from permitting to transporting water and soil to the top of a building.

Some people are more likely than others to gain weight from frequently indulging in fried foods, scientists say. You can blame Mom and Dad for passing on the obesity risk genes.

Many meat-eating animal lovers may not realize that their hankering for hamburgers hurts wildlife. A conservation group says some species have already been driven extinct by the livestock industry.

Environmentalists, meanwhile, are worried that the spill happened at the worst possible moment — the peak of birding season.

McDonald's says it will start to buy beef that's "verified sustainable" in 2016. But defining sustainable beef production is tricky because the environmental issues involved are so complex.

Air pollution causes 1 in 8 deaths worldwide, with half of the deaths caused by fumes from home stoves. Fixing the problem isn't as simple as providing more efficient stoves. Habits must change, too.