Republican senators and business groups are questioning how the Environmental Protection Agency determines the costs and benefits of its regulations.

At a hearing Wednesday at the Senate Environment and Public Works Superfund, Waste Management and Regulatory Oversight subcommittee, some business leaders accused the EPA of overestimating the benefits of its regulations.

Diana Furchtgott-Roth, director of Economics21 at the Manhattan Institute for Policy Research, said one example is in the Clean Power Plan, which is meant to limit carbon emissions. The EPA included the limitation of substances that aren't carbon when calculating the dollar value of the plan's benefits, she said.

"The benefits listed for the Clean Power Plan are about $15 billion in 2025," she said. "But, the benefits shrink to $3.6 billion if the health benefits of other substances [that are not carbon] are removed."

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