The divestment movement started on campuses. Now it’s seeping, like black tar from a leaky oil rig, into a city near you.

On Tuesday, New York City announced it would divest pension funds from fossil fuel interests, joining New York State, a cadre of other U.S. cities, and some private universities who say they will pull investments from companies that extract coal, gas, and oil. De Blasio also announced the city’s plans to sue five major oil companies for their role in damages brought on the cit…