CASPER, Wyo. (AP) — Wyoming Gov. Matt Mead, a climate-science skeptic from the nation's top coal-producing state, says he could be wrong about the causes of global warming but is arguing for cleaner technology to burn coal rather than trying to eliminate its use.

Mead's comments came in a speech Wednesday.

The Republican governor reaffirmed he is skeptical about research showing humans are causing climate change but said he's not a scientist and might be wrong.

He said weak coal industry earnings suggest investors have accepted evidence of human-caused climate change.

Mead accused the Environmental Protection Agency of trying to shut down coal-fired plants and wants the agency to withdraw proposed new rules. He says the government should look for ways to keep burning coal while reducing its pollution.