A worker in Claysville, Pa., shovels the fine powder that's part of a watery mixture used in hydraulic fracturing. Silica dust is created in a wide variety of construction and manufacturing industries, too. Keith Srakocic/AP hide caption

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Keith Srakocic/AP

Tighter, Controversial Silica Rules Aimed At Saving Workers' Lungs

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A coal miner stands in the Dotiki mine, operated by Alliance Coal, in Webster County, Ky. Steve Inskeep/NPR hide caption

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Steve Inskeep/NPR

In Kentucky, The Coal Habit Is Hard To Break

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Contaminated wastewater is seen at the entrance to the Gold King Mine in San Juan County, Colo., in this picture released by the Environmental Protection Agency. The photo was taken Wednesday; the plume of contaminated water has continued to work its way downstream. Reuters /Landov hide caption

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Reuters /Landov

Women and their children wait for medication and instructions on how to use it at the clinic in Dareta, Nigeria. Treating children with high levels of lead is a painstaking process that works only if their environment at home is free from lead. David Gilkey/NPR hide caption

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David Gilkey/NPR

Fallout From Financial Crisis: Thousands Of Nigerian Kids Poisoned By Lead

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Women and their children wait for medication and instructions on how to use it at the clinic in Dareta, Nigeria. Treating children with high levels of lead is a painstaking process that works only if their environment at home is free from lead. David Gilkey/NPR hide caption

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David Gilkey/NPR

In Nigerian Gold Rush, Lead Poisons Thousands Of Children

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Brandi and Kaylee plan to open a truck repair shop when they graduate from high school. Robert Smith/NPR hide caption

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Robert Smith/NPR

Boom Town, U.S.A.

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Mine helmets and painted crosses sat at the entrance to Massey Energy's Upper Big Branch coal mine on April 5, as a memorial to the 29 miners killed there one year earlier. Jeff Gentner/AP hide caption

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Jeff Gentner/AP

From NPR's Newscast

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