Take the National Environmental Policy Act. Enacted in 1970, NEPA requires federal agencies to conduct environmental reviews for nearly every project that the government touches. Completing an impact statement under this process now takes four and a half years on average and can cost millions of dollars. Reviews can run for hundreds of pages. Lawsuits, often brought by activist groups, can extend the process interminably. Green projects aren’t immune from this burden: An analysis last year found that of the projects undergoing NEPA review at the Department of Energy, 42% concerned clean energy, transmission or environmental protection, while just 15% were related to fossil fuels.