By Andrew Langer

COVID-19 has caused a worldwide economic collapse. Yet some radical environmentalists are celebrating.

As factories remain shuttered and drivers stay off the roads, emissions are falling. Worldwide energy-related carbon emissions will drop as much as 5.4 percent this year, according to Goldman Sachs.

Many green activists can scarcely contain their glee. "This is an opportunity to talk about . . . planned degrowth," gushed one University of Vermont economist. "Suppose you were a policymaker, and you were thinking about what you would do to lower emissions -- you just got a p...