“There’s a warming trend, the climate is changing and human activity contributes to that change in some measure,” Pruitt said on “Fox News Sunday.”

“The real issue is how much we contribute to it and measuring that with precision,” said the EPA chief, whose appointment was greeted with great concern by environmental activists.

Pruitt’s stance is a departure from his remarks less than a month ago that carbon emissions are not “a primary contributor” to 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, so no, I would not agree that it’s a primary contributor to the global warming that we see,” Pruitt said last month on CNBC’s “Squawk Box.”