"“Right now, we have about ninety per cent or ninety-five per cent of the technology we need,” Mark Jacobson, a professor of civil and environmental engineering at Stanford, told me. In a series of papers, Jacobson and his colleagues have laid out “roadmaps” to a zero-emissions economy for fifty states, fifty-three towns and cities, and a hundred and thirty-eight other countries, with a completion date of 2050. Just as in the Democrats’ Green New Deal, the central element... is converting the electric grid to clean energy by shutting down power stations that rely on fossil fuels and making some very large investments in wind, solar, hydroelectric, and geothermal facilities."