The novel coronavirus shutdowns and restrictions are slowly being lifted in most areas, but already warnings of a “climate shutdown” have begun reverberating on the environmental left. A leading U.N. economist who advises European governments last week sent up a trial balloon via an article titled “Avoiding a Climate Lockdown,” arguing that in “the near future, the world may need to resort to lockdowns again — this time to tackle a climate emergency.” “Under a ‘climate lockdown,’ governments would limit private-vehicle use, ban consumption of red meat, and impose extreme energy-saving measures, while fossil-fuel companies would have to stop drilling,”...