Kevin McCarthy plays the "Exxon" card

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Senate Majority Leader Mike Gronstal, D-Council Bluffs, dismissed the concerns of the global warming doubters.

"They should move to Australia," Gronstal said. "Ostriches put their head in the sand."

House Majority Leader Kevin McCarthy, D-Des Moines, questions the concerns being raised by the GOP lawmakers.

"There is not any scientist that we're aware of in the United States of America, outside of some connection to big business or oil, that doesn't believe in what's happening with our climate change, with carbon emissions, with global warming," McCarthy said.