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Ukrainian forces attack a second border region in western Russia, where the governor declares a state of emergency. Ukraine also targets air bases in at least a half-dozen regions.

There's increasing concern about PFAS, the substances commonly called forever chemicals found throughout the environment. Now volunteers in Minnesota are collecting pine needles throughout the state in an effort to help researchers determine how PFAS find their way in water, soil, and air when there seems to be no obvious source

The amount of carbon dioxide in the atmosphere has crossed the "psychological threshold" of 400 parts per million. That number is one of the clearest measures of how humans are changing the planet by burning fossil fuels.

Ofeibea Quist-Arcton is an award-winning broadcaster from Ghana and is NPR's Africa Correspondent. She describes herself as a "jobbing journalist"—who's often on the hoof, reporting from somewhere.

Renewable energy is taking off across the nation, but storing the energy is still a problem that is challenging companies to innovate, with solutions ranging from molten salt to ice.

Air traffic control lost contact with the Cessna just 15 minutes after takeoff, the NTSB tells NPR. The wayward business jet set off military and defense alarms in the national capital area.

Research in recent years has pointed to more incidents of clear-air turbulence in the jet stream brought on by rising temperatures. Airline crews and passengers are feeling the effects firsthand.

Greece's defense minister says its air traffic controllers tracked the plane as it fell before it disappeared. Mary Louise Kelly talks to NPR's Russell Lewis and aviation analyst Alex Macheras.

While this season's air quality is a marked improvement over recent years, smoke is still causing some disruption for events downwind from wildlands.

Wildfires continue to devastate northern California. As relief efforts continue, Sonoma County Supervisor Shirlee Zane speaks about the dangers in air quality and what's been damaged.