Environment

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FILE - In this July 27, 2004 file photo, poet and activist Maya Angelou Tuesday, July 27, 2004, speaks on stage during the Democratic National Convention, in Boston. Angelou, a Renaissance woman and cultural pioneer, has died, Wake Forest University said in a statement Wednesday, May 28, 2014. She was 86. (AP Photo/Stephan Savoia, File)

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FILE - In this Jan. 20, 1993 file photo, U.S. President Bill Clinton reaches out to hug poet Maya Angelou after she delivered the inaugural poem during his inauguration ceremony in Washington, D.C. Angelou, a Renaissance woman and cultural pioneer, has died, Wake Forest University said in a statement Wednesday, May 28, 2014. She was 86. (AP Photo/Mark Lennihan, File)

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FILE - In this Oct. 17, 2013 file photo, Maya Angelou, seated, Junot Diaz, back left, Norman Mailer Center president and co-founder Lawrence Schiller, center, and Samuel R. Delany, pose for photographs during the fifth annual Norman Mailer Center benefit gala at the New York Public Library in New York. Angelou, a Renaissance woman and cultural pioneer, has died, Wake Forest University said in a statement Wednesday, May 28, 2014. She was 86. (Photo by Evan Agostini/Invision/AP, File)

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FILE - In this May 17, 2011 file photo, Maya Angelou, left, and Oprah Winfrey laugh during a star-studded double-taping of "Surprise Oprah! A Farewell Spectacular," in Chicago. Angelou, a Renaissance woman and cultural pioneer, has died, Wake Forest University said in a statement Wednesday, May 28, 2014. She was 86. Angelou was a mentor to Winfrey, whom she befriended when Winfrey was still a local television reporter, and often appeared on her friend's talk show program. (AP Photo/Charles Rex Arbogast, File)

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FILE - In this Nov. 3, 1971 file photo, Maya Angelou poses with a copy of her book, "I Know Why the Caged Bird Sings," in Los Angeles. Angelou, a Renaissance woman and cultural pioneer, has died, Wake Forest University said in a statement Wednesday, May 28, 2014. She was 86. (AP Photo/File)

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FILE - In this Dec. 15 1992 file photo, American poet and writer Maya Angelou speaks in Washington, D.C. Angelou, a Renaissance woman and cultural pioneer, has died, Wake Forest University said in a statement Wednesday, May 28, 2014. She was 86. (AP Photo/Doug Mills, File)

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FILE - In this Nov. 21, 2008 file photo, poet Maya Angelou smiles at an event in Washington. Angelou, a Renaissance woman and cultural pioneer, has died, Wake Forest University said in a statement Wednesday, May 28, 2014. She was 86. (AP Photo/Gerald Herbert, File)

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FILE - In this Sept. 12, 2005, file photo, the city of Johnstown, Pa., is seen below a placard describing the great flood of 1889 at an observation deck on a mountain above the town. As officials prepare to commemorate the 125th anniversary of the enormous Johnstown Flood of 1889 that killed 2,209 people, new research has helped explain why the deluge was so deadly. (AP Photo/Keith Srakocic, File)