body -- >> why is the climate changing? >> senator, in response to the co2 issue, the epa administrator is constrained by statutes -- >> i'm not -- i'm asking you a personal opinion. >> my personal opinion is immaterial. >> really? >> to the job of -- to the job of -- >> you are going to be the head of the agency to protect the environment and your personal feelings about whether climate change is caused by human activity and carbon emissions is immaterial? >> and in fact, scott pruitt never directly answered that question. senator sanders also went after pruitt on the issue of all the earthquakes in his home state of oklahoma, earthquakes that scientists say are being caused by the injection of waste water from the fracking process that gets oil and gas out of shale. and he asked him if he had ever filed a suit or study up and said anything about those earthquakes? and scott pruitt could not answer. and after that very tense