President-elect Donald Trump on Saturday named Chris Wright, head of a Denver-based oilfield service company who has disputed the role of climate change in causing extreme weather, to head the Energy Department.

Wright, a major Republican fundraiser, would be one of the loudest voices in the administration against the confirmed science that greenhouse gas emissions are raising the planet’s temperature and causing an upsurge in extreme weather. The Energy Department, which is tasked with maintaining the nation’s nuclear weapons stockpile, regulating everyday appliances and managing the national labs, will likely play a critical role supporting the fossil fuel industry under Trump.

During the Biden administration, the department helped dole out grants and loans to quicken the transition to low-carbon power — something that Wright has called unnecessary.