President Obama's environmental plan won't be so hard for states that have moved to cut emissions. But for others it will be more difficult. Scott Olson/Getty Images hide caption

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Laws in Montana, Utah, North Dakota, Missouri, Kansas, Iowa and North Carolina have also made it illegal for activists to smuggle cameras into industrial animal operations. iStockphoto hide caption

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A worker at Ford's assembly plant in Wayne, Mich., installs back seats made from soy-based foam in a Ford C-Max. Jason Margolis/NPR hide caption

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Tenor Placido Domingo performs the title role in a 1994 performance of Verdi's Otello at the Metropolitan Opera in New York. Johan Elbers/The LIFE Images Collection/Getty Images hide caption

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Yaupon growing in the wild in east Texas. This evergreen holly was once valuable to Native American tribes in the Southeastern U.S., which made a brew from its caffeinated leaves. Murray Carpenter for NPR hide caption

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Of the roughly 40 houses currently rented in Hope Meadows in Rantou, Ill., 10 are occupied by families who've adopted children from foster care. The rest are occupied by older adults who volunteer to help them. Ina Jaffe/NPR hide caption

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Pep is featured in the Dec. 26, 1925 issue of the Boston Daily Globe. But Gov. Pinchot's wife, Cornelia, later set the tall tale straight in an interview with The New York Times. The Boston Evening Globe / Courtesy of Boston Public Library hide caption

itoggle caption The Boston Evening Globe / Courtesy of Boston Public Library

"I don't like a government shutdown, but this is a clear case of totally improper use of taxpayers' dollars. I have an obligation to the taxpayers of Arizona," said Sen. John McCain. He had scolded his Republican colleagues in 2013 for shutting down the government over the Affordable Care Act. He says this issue is different. Mandel Ngan/AFP/Getty Images hide caption

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Daniel Harmon, a veteran of the wars in both Afghanistan and Iraq, looks out the window of his room at the Hollywood Veterans Center in Los Angeles. The facility provides housing to homeless vets. David Gilkey/NPR hide caption

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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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PCORI Executive Director Joe Selby says grants to medical societies are needed to get through to busy professionals who "may not answer our phone calls." Stephen Elliot/Courtesy of PCORI hide caption

itoggle caption Stephen Elliot/Courtesy of PCORI