thing 1 tonight, it is no secret the trump administration has installed the usher echelons of involvement people who deny the role humans play in climate change. >> 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. >> nobody really knows. i've -- look, i'm somebody that gets it. and nobody really knows. >> do you yourself believe in climate change? >> i believe there is science on both sides that are accurate. >> you know, what's wrong with being a skeptic? >> for some reason or another this issue of climate change has emerged as a paramount issue for the left. >> can you say whether or not the president believes that human activity is contributing to the warm of the climate? >> i haven't asked him. >> but in addition to political appointees, there are still career scientists who work in the federal government and they