As of Friday’s inauguration, we can now say ‘President Donald Trump’, and that new status could have far-reaching implications for the environment. While campaigning, Trump said he would make some big changes to environmental regulations, including spearheading an overhaul of the Environmental Protection Agency. That sounds like a big claim. But what exactly can Donald Trump do when it comes to the country’s environmental laws and rules? That is, what does he actually have the power to do as President? We put that question to Jody Freeman, the founding director of Harvard’s Environmental Law Program.