After the pigeons are fitted with pollution sensors, they are released into different parts of London. Londoners can then get live air quality readings via Twitter. Rich Preston/NPR hide caption

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Rich Preston/NPR

Pigeons Are London's Newest Pollution Fighters

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One Of The Nation's Biggest Urban Forests Isn't Where You'd Expect

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The Speck air quality monitor costs $200, but is available to all through Pittsburgh's public library system. Carnegie Mellon University CREATE Lab hide caption

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Carnegie Mellon University CREATE Lab

A Home Air Quality Monitor That Can Be Checked Out From The Library

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Burden Of Proof Hurt State In N.J.-Exxon Settlement, Some Say

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Bayway Refinery in Linden, N.J., is one of two refineries that are involved in the settlement. It's no longer owned by Exxon, but they are on the hook for the cleanup. Joel Rose/NPR hide caption

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Joel Rose/NPR

Exxon Settlement Falls Short Of Damage, N.J. Democrats Say

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The abandoned Cherokee Clay and Brick Mine in Lee County, N.C., may become a landfill for coal ash. Dave DeWitt/WUNC hide caption

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Dave DeWitt/WUNC

After Toxic Ash Spill, Energy Company And Locals Struggle Over Solution

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Journalist Chai Jing used $160,000 of her own money to produce a documentary on China's air pollution problem. Screenshot/Under the Dome hide caption

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Screenshot/Under the Dome

The Anti-Pollution Documentary That's Taken China By Storm

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A fisherman collects water on a beach littered with trash at an ecological reserve south of Manila in 2013. Francis R. Malasig/EPA/Landov hide caption

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Francis R. Malasig/EPA/Landov

8 Million Tons Of Plastic Clutter Our Seas

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Lynn Good has had many mentors throughout her career — but few of them were women. "So I'm generationally on the early part of the ascent of women into leadership roles," the Duke Energy president and CEO says. Pat Sullivan/AP hide caption

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Pat Sullivan/AP

Duke Energy CEO: 'I Don't Think Of Myself As A Powerful Woman'

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Xiang Zhengming plants rice seedlings in a field in southeast China's Fujian Province earlier this month. A newly released report says nearly 20 percent of the country's farmland is contaminated. Lin Shanchuan/Xinhua/Landov hide caption

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Lin Shanchuan/Xinhua/Landov

Exhausts rises from a truck in California last September. Mike Blake/Reuters/Landov hide caption

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Mike Blake/Reuters/Landov

Researchers have found that the oft-maligned banana peel can grab heavy metals out of polluted water. iStockphoto.com hide caption

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iStockphoto.com

Actor Jessica Alba, accompanied by Sen. Frank Lautenberg (D-NJ), reacts when a buzzer calling for a vote goes off during a news conference on Capitol Hill Tuesday about chemical regulation. Evan Vucci/AP hide caption

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Evan Vucci/AP

Are BPA-free bottles really safer than the ones that are chock-full of bisphenol A? Good luck trying to find out. David McNew/Getty hide caption

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David McNew/Getty