Greta Thunberg, Joaquin Phoenix and fellow eco-luminaries used Earth Day Wednesday to rejoice in the global economic shutdown that has led to a reduction in carbon emissions.

The pandemic has been a dream come true for climate alarmists . . . if you ignore all the misery.

They wanted us to switch off our economies to prevent a supposed climate apocalypse in 10 years and — hey, presto! — their wish was granted by a virus.

Thunberg, the 17-year-old Swedish climate evangelist, did caution…