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UNITED STATES - SEPTEMBER 24: Sen. Tom Carper, D-Del., chairs the Senate Environment and Public Works Committee Clean Air and Nuclear Safety Subcommittee hearing on "Black Carbon - A Global Health Problem with Low-Cost Solutions" on Tuesday, Sept. 24, 2013. (Photo By Bill Clark/CQ Roll Call)

UNITED STATES - SEPTEMBER 24: Sen. Tom Carper, D-Del., chairs the Senate Environment and Public Works Committee Clean Air and Nuclear Safety Subcommittee hearing on "Black Carbon - A Global Health Problem with Low-Cost Solutions" on Tuesday, Sept. 24, 2013. (Photo By Bill Clark/CQ Roll Call)

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