Doug Burgum, the Republican governor of North Dakota, has emerged as a key adviser on energy issues in Donald J. Trump’s campaign to retake the White House, acting as a liaison between Mr. Trump and the oil billionaires whom the former president has encouraged to fund his presidential bid.

Along the way, Governor Burgum has articulated a sophisticated policy approach that can at times seem environmentally conscious, but in fact is designed to benefit oil, gas and coal, the fossil fuels that are driving climate change.

“It’s a tale of two Dougs,” said Dustin Gawrylow, a conservative political commentator in North Dakota.

Mr. Burgum set a goal in 2021 that North Dakota would stop adding carbon dioxide to the atmosphere by 2030, becoming “carbon neutral.” Carbon dioxide from burning oil, gas and coal is a major driver of global warming.

“What other state is doing carbon neutral by 2030?said Heather Reams, the president of Citizens for Responsible Energy Solutions, a group that tries to engage Republicans on climate policy.

“I was very impressed by the level of detail that he had,” said Ms. Reams, who recalled speaking to Governor Burgum about his carbon neutrality plan at a Republican Governors Association meeting. “Not like he gave me a couple of talking points and walked away. He talked about how this was about economic prosperity, national security, energy independence.”