It’s getting easier to be green, with pop culture finally catching on to the idea that the planet could use a little saving. Sure, Earth Day’s been around since 1970, but if you thought it was just a day for schoolkids to learn about recycling, it’s time for you to show a little love to the Mother. Today, paint one of the thousand six-inch blank canvases at the Central Park Bandshell, which will be added to a 500-foot Green Mural, assembled by artist Paul Kostabi over the course of two days. The result will be displayed at Rumsey Playfield tomorrow, to coincide with the Green Apple Festival, where you can learn how to mulch and make recycled crafts and also catch performances by Vienna Teng, Jordin Sparks, and the Bacon Brothers. There’s also free valet bike parking—helpful for those who ride up with Time’s Up’s annual Earth Day Bike/Skate. On Monday, NYU kicks off the 2008 Humanities Festival, featuring nine plays over three days on the topic of global warming. Tonight’s program includes new works by Sarah Ruhl, Jon Robin Baitz, and Lisa Kron. Green Mural: Saturday at 12, Central Park Bandshell,; Green Apple Festival: Sunday at 12, Central Park Rumsey Playfield, 212-310-6600,; Bike/Skate: Sunday at 1:45, Union Square Park South, 212-802-8222,; Humanities Festival: Monday at 6:30, Atlas Room Theater, 111 Second Avenue, third floor, 212-998-2100; all events are free

Sat., April 19, noon, 2008