Fox is launching its first networkwide public service campaign in two years: "Green It. Mean It."

Timed to lead up to Earth Day on April 22, the weeklong eco-themed campaign starts today and includes on- and off-air elements including promos starring Fox talent.

Omar Epps and Lisa Edelstein from "House," Emily Deschanel from "Bones" and Kelsey Grammer and Fred Willard from "Back to You" are among those who will offer "green tips" to viewers, and Fox affiliates are offered an "Are You Smart Enough to Save the Planet?" promotion to drive tune-in for a special two-hour "Are You Smarter Than a 5th Grader?"

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