Following his comments last week during an interview on CNBC’s “Squawk Box,” U.S. Environmental Protection Agency Administrator Scott Pruitt is now the target of an organized telephonic protest, according to Politico’s Morning Energy report.

OK Energy Today reported on March 9 that Pruitt cast doubts that carbon dioxide is a main cause of global warming.

“I think that measuring with precision human activity on the climate is something very challenging to do and there’s tremendous disagreement about the degree of impact,” said the former Oklahoma Attorney General. “So no, I would not agree that it’s a primary contributor to the global warming that we see.”

“But we don’t know that yet, we need to continue the debate and continue the review and the analysis,” added Pruitt.

Pruitt’s comments incited more than 300 phone calls to the EPA last Thursday and Friday. The calls were initiated through social media rather than the Sierra Club or a similar environmental group.

During Pruitt’s nomination, more than 2,000 callers flooded the phone lines in opposition to the former Oklahoma Attorney General.