NEW YORK — Everyone knows that Charlie Brown’s nemesis is a kite-eating tree. But the “Peanuts” hero is hoping to cool that kind of rivalry as we head into Earth Day and Arbor Day.

It's one of several ways the cartoon gang is celebrating the Earth this year. “Peanuts” is also opening its vault to release one of its classic cartoons, 1976's “It’s Arbor Day, Charlie ...