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Kentucky Sen. Rand Paul believes man and nature play a role in climate change, but thinks more work needs to be done to deregulate the energy sector, including fossil fuels.

Paul was one of 15 Republican senators to sign a resolution supporting the statement that humans play a role in climate change and reiterated that belief at the fourth Republican presidential primary debate Tuesday. He said he would encourage development of energy in "all forms."

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"We need solar and wind and hydro, but we also need coal and we still need natural gas," Paul said.

Paul joined former Florida Gov. Jeb Bush in calling for the repeal of the Clean Power Plan, Obama's signature environmental regulation that would limit carbon emissions from new and existing power plants.

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