It’s tough to compare the costs and benefits of the Trump and Obama regulations. The two administrations had different focuses, used different models, and made different assumptions, according to the Congressional Research Service. And they came up with vastly different numbers, Yale economist Kenneth Gillingham and a team of researchers reported last year in the journal Science.
Reconciling the analyses will be a challenge. In a strike against transparency, a federal judge has ruled that the Trump administration won’t need to show its work. The lawsuit was over the model that the Obama administration had used when it determined that its clean car rules were “practical and feasible” for carmakers. And the decision means the Trump administration doesn’t need to disclose it.