The Trump administration dedicated itself to deregulation with unprecedented fervor. It rolled back scores of regulations across government agencies, including more than 80 environmental rules. The Biden administration can reverse some of those actions quickly – for instance, as president, Joe Biden can undo Donald Trump’s executive orders with a stroke of the pen. He plans to restore U.S. involvement in the Paris climate agreement that way on his first day in office. Undoing most regulatory rollbacks, however, will require a review process that can take years, often followed by further delays during litigation. There is an alternative, but it comes with risks.