California's top air regulator says that if the Trump administration or Congress succeeds in blocking the state's ability to enforce its current vehicle greenhouse gas standards or adopt future rules, such a move would “destroy” the state's sweeping regulatory plan to meet its 2030 GHG target. The proposed regulatory “scoping” plan features California's cap-and-trade program as its centerpiece, but it also includes planned and existing climate rules for a host of sectors, including the vehicle GHG standards. “There's no question...