Scott Pruitt increasingly looks the worst of the worst out of the appalling cabinet of President Trump, quite aside from his race to become the single most corrupt cabinet member in the entire history ofthe US. The latter is trivial compared to his policy change after policy change that will increase pollution in the environment and end up killing people, to be blunt about it. But now the Environmental Economics blog reports that since June 7 Pruitt's EPA has been planning to distort benefit-cost in a way to make it less likely to support environmental policy enforcement (sorry not able to make link to site work).
In particular they are planning to eliminate counting "co-benefits" of policies. Only what a policy is specifically directed at can be counted. So, if one looks at coal burning and wishes to limit particulate emissions, then one cannot count co-benefits such as reducing SO2 and mercury emission. This is simply outrageous and makes no sense whatsoever. But indeed, Scott Pruitt may be the worst cabinet member in US history, and Trump seems to be in no hurry to remove him, indeed, defends him.