Today's 25th anniversary of Earth Day dominates much of the programming, including some daytime viewing aimed at children.
* "Earth Day on MPT" (9:30 a.m.-11 p.m., MPT, Channels 22 and 67) -- The state's public television operation devotes much of today's lineup to programs of environmental interest (with the exception of regular syndicated cooking shows). First up at 9:30 a.m., for kids, is "3-2-1 Contact Extra: A Popular Little Planet." Notable at 9 p.m. is the MPT-produced "Outdoors Maryland: Earth Day Special."
* "Wild Things: An Earth Day Special" (12:30 p.m., WMAR, Channel 2) -- Jodie Sweetin ("Full House"), Jonathan Jackson ("General Hospital") and Marquise Wilson ("Hangin' With Mr. Cooper") explore how various species give birth in a special for children. ABC.
* "Success Through Education: A Salute to Black Achievement" (2 p.m.-3 p.m., WJZ, Channel 13) -- A Baltimore School for the Arts alumna, actress Jada Pinkett, is among the success stories presented by this fifth annual special, with host Steve Harvey ("Me and the Boys"). CBS.
* "The Adventures of Mary-Kate and Ashley" (8 p.m.-9 p.m., WMAR, Channel 2) -- The Olsen twins from "Full House" present a home-video special aboard a cruise ship. ABC.
* "Christy" (8 p.m.-9 p.m., WJZ, Channel 13) -- Christy (Kellie Martin) is jealous of a rival for the man she's interested in. All the men of Cutter Gap, meanwhile, set out on their annual deer hunt. CBS.
* "Follow the River" (9 p.m.-11 p.m., WMAR, Channel 2) -- In another frontier drama, Sheryl Lee (Laura Palmer in "Twin Peaks") plays a young woman who is captured by Shawnee warriors. She and another captive (Ellen Burstyn) escape and set out for home. The movie is based upon a historical novel by James Alexander Thoms. ABC.
* "Sweet Justice" (9 p.m.-10 p.m., WBAL, Channel 11) -- The series concludes its season as Kate (Melissa Gilbert) asks Carrie Grace (Cicely Tyson) to defend her father (Ronny Cox), who has been charged with murder. NBC.
* "Don Kirshner's Rock Concert" (3 p.m.-7 p.m., VH1) -- Remember the 1970s show that launched some big names? It's coming back as a limited run series next week, and the cable network is running a marathon of notable episodes from the past.