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The executives were whether they agreed with Blankenship that climate change is a hoax. Peabody, Arch and the Ohio Association have all joined lawsuits challenging the EPA's authority to regulate emissions.

Carey, in his opening remarks, repeated that position, saying: "We believe that the science undermining the EPA finding is questionable." The three other executives on the stand all claimed to believe in the science, just not the need for regulation.

However, Peabody's Gregory Boyce also said there needed to be an independent review of the UN's Intergovernmental Panel of Climate Change (IPCC) and other science. "We think the EPA should take a step back and do more work."