Flares at the Bridgeton Landfill outside St. Louis burn off noxious fumes, including those generated by an underground fire that's been burning since 2010. The "fire" is really a high-temperature chemical reaction that consumes the waste below the landfill's surface. Véronique LaCapra/St. Louis Public Radio hide caption

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Scientists who work for nuclear waste disposal projects in Finland, Canada and Sweden study an ice sheet in western Greenland. Courtesy of Vincent F. Ialenti hide caption

toggle caption Courtesy of Vincent F. Ialenti

Workers at the Waste Isolation Pilot Plant are still investigating what caused a radioactive release at the site, but organic cat litter may be the culprit. DOE/WIPP hide caption

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The Two-Way

Organic Cat Litter Chief Suspect In Nuclear Waste Accident

The release of plutonium at a New Mexico nuclear dump may have been caused by a bad purchase at the pet shop.

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A worker drives an electric cart past air monitoring equipment inside a storage room of the Waste Isolation Pilot Plant in Carlsbad, N.M., shown in this undated photo. Anonymous/AP hide caption

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