Vehicle GHG Rule Rollback Triggers Fight Over Agencies' Safety, Cost Data

The Trump administration's proposal to freeze vehicle greenhouse gas and fuel economy standards after model year 2020 is triggering a fight over the safety and cost assumptions EPA and the National Highway Traffic Safety Administration (NHTSA) use to justify the plan, which could be central to any legal fight over a final version of the plan. “What we have concluded is things have changed” since issuance of the original regulations, EPA air chief William Wehrum said during a joint Aug...