Environment

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North Carolina's Brittany Rountree, bottom, and Wake Forest's Kandice Ball, top, chase a loose ball during the first half of an NCAA college basketball game at the Atlantic Coast Conference tournament in Greensboro, N.C., Thursday, March 6, 2014. (AP Photo/Chuck Burton)

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North Carolina's Allisha Gray, center, looks to pass as she is trapped by Wake Forest's Jill Brunori, left, and Millesa Calicott, right, during the first half of an NCAA college basketball game at the Atlantic Coast Conference tournament in Greensboro, N.C., Thursday, March 6, 2014. (AP Photo/Chuck Burton)

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Teams stand near their benches as the arena is lit only by emergency lights after a power outage during the second half of an NCAA college basketball game between North Carolina and Wake Forest at the Atlantic Coast Conference tournament in Greensboro, N.C., Thursday, March 6, 2014. (AP Photo/Chuck Burton)

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National Edition News cover for March 7, 2014 - Bill Clinton cashes in on nonprofit hospital: Former U.S. President Bill Clinton speaks during a forum on renewable energy in San Juan, Puerto Rico, Tuesday, July 16, 2013. Clinton urged Puerto Rico to lessen its oil dependence and pursue clean energy alternatives. Puerto Rico depends on petroleum to generate nearly 70 percent of its power, but the government in recent years has unveiled several renewable energy projects in a push to drive down costs and cut greenhouse emissions. (AP Photo/Ricardo Arduengo)

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At a Crossroads: Sen. Ted Cruz (left) of Texas, Louisiana Gov. Bobby Jindal (center) and Sen. Marco Rubio of Florida are among the conference speakers grappling with the question of how to govern while sticking to conservative principles. (Associated Press)

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Officials from the ATF and Detroit Fire Department survey the debris from a 4-alarm fire at the Jason Manor Apartments on Jason at Schoolcraft on the Northside of Detroit, Thursday, March 6, 2014. Firefighters battled the blaze early Wednesday morning and now officials have confirmed, the fire that left dozens of residents homeless, was caused by arson.(AP Photo/ The Detroit News, Todd McInturf)

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Officials from the ATF and Detroit Fire Department survey the debris from a 4-alarm fire at the Jason Manor Apartments on Jason at Schoolcraft on the Northside of Detroit, Thursday, March 6, 2014. Firefighters battled the blaze early Wednesday morning and now officials have confirmed, the fire that left dozens of residents homeless, was caused by arson. (AP Photo/ The Detroit News, Todd McInturf)

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ADVANCE FOR SUNDAY MARCH 9 - In this Feb. 17, 2014 photo, Tina Saiz the widow of a Felipe Saiz who killed in a drilling rig accident that occurred at Heart Land Drilling Rig 11 in June 2013, holds a locket she wears with some of her late husbands ashes in Big Spring, Texas. The federal Occupational Safety and Health Administration keeps a list of "the worst of the worst" employers in the nation and drilling companies with multiple fatalities should be on it, safety experts say. (AP Photo/Houston Chronicle, James Nielsen)