Under President Joe Biden, the Environmental Protection Agency has closed fewer civil cases against polluters than any administration in the last two decades and has overseen a drop in criminal investigations of environmental crimes. David Uhlmann hopes to change that. Uhlmann, 60, begins a new job this week as the agency’s top cop. An expert on environmental law, Uhlmann is leading the EPA unit that holds companies and individuals accountable for fouling drinking water, dumping hazardous waste,