 Pruitt's legal document outlining the rationale to roll back a regulation on greenhouse emissions from vehicle tailpipes was 38 pages long, lacked the kind of data that courts expect in cases involving environmental regulations, and was mostly direct quotes from public comments made by automaker lobbyists.In contrast, the Obama administration's rationale for implementing the regulation in the first place was 1,217 pages long.On March 9, 2017, in an interview on CNBC's Squawk Box, Pruitt stated that he "would not agree that" carbon dioxide is "a primary contributor to the global warming that we see" backing up his claim by stating 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."