Environment and Public Works Committee Chairman Sen. James Inhofe, R-Okla., speaks with Sen. Barbara Boxer, D-Calif., on Thursday before joining a bipartisan group of senators at a Capitol Hill news conference to discuss legislation to improve the federal regulation of chemicals and toxic substances. J. Scott Applewhite/AP hide caption

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The fleet of U.S. vehicles has kept its fuel efficiency at a record high, the EPA says. Here, an electric BMW i3 is seen in Miami. Nicholas Hunt/Getty Images hide caption

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Soybeans are sprayed in Iowa in 2013. Enlist Duo is a mixture of two chemicals that farmers have used separately for many years: glyphosate (also known as Roundup) and 2,4-D. The new formulation is intended to work hand-in-hand with a new generation of corn and soybean seeds that are genetically engineered to tolerate sprays of both herbicides. Charlie Neibergall/AP hide caption

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A production facility that created lead paint and other lead products once stood at Almond and Cumberland Streets, across Aramingo Avenue in Philadelphia. Kimberly Paynter/WHYY hide caption

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Calls Continue For EPA To Clean Up Former Lead Production Site In Philly

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A Volkswagen Passat is tested for exhaust emissions, at a Ministry of Transport testing station in London. In the U.S., a 1998 copyright law prevents safety researchers from accessing the software that runs cars. John Stillwell/PA Photos/Landov hide caption

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Amid VW Scandal, Critics Want Access To Carmakers' Computer Code

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Matthias Mueller, new chief executive of Volkswagen AG, attends a news conference at the VW factory in in Wolfsburg, Germany, on Friday. Mueller takes over after Martin Winterkorn resigned earlier this week amid a diesel emissions-testing scandal. Julian Stratenschulte/EPA/Landov hide caption

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Volkswagen CEO Martin Winterkorn (left) apologized for his company's actions, saying, "We do not and will not tolerate violations of any kind of our internal rules or of the law." He's seen here on the first day of the Frankfurt Auto Show last Thursday, one day before the EPA said VW had cheated on emissions tests. Jens Meyer/AP hide caption

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Volkswagen Jetta models — like this TDI from 2011 labeled "clean diesel" — were found to have software that cheated official emissions tests, the EPA says. More than 480,000 cars are affected. Ramin Talaie/Getty Images hide caption

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After the Animas River spill, rancher Irving Shaggy is forced to travel a 70-mile round trip to get water for his livestock. "It's going to be a long struggle," he says. Laurel Morales/KJZZ hide caption

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Navajo Nation Farmers Feel The Weight Of Colorado Mine Spill

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A coal scraper machine works on a pile of coal at American Electric Power's Mountaineer coal power plant in 2009 in New Haven, W.Va. The state, in which coal mining is a major industry, is one party planning to sue the Environmental Protection Agency regarding new power plant regulations announced Monday. Saul Loeb/AFP/Getty Images hide caption

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New Power Plant Rules Likely To Start Slow-Burning Debate, Legal Action

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