EARTH DAZE

Earth Day programming won’t be limited to just April 22. Networks and cable channels are airing programs throughout the month to honor Mother Earth. Here’s a sampling:

DISCOVERY

Sunday through Thursday, the Discovery Channel premieres the miniseries Ocean Planet, which examines the ocean’s cultural, economic, political and environmental significance to the Earth. The installments are “Finite Oceans,� “The Last Hunters,� “The Healing Sea� and “The Tides of Change,� 9-10 p.m.

DISNEY CHANNEL

On Earth Day: The Cropp Family Nature Album: The Sharks of Ningoloo Bay, 5 p.m.; This Island Earth, 6 p.m.; Spaceship Earth: Our Global Environment, 8:30 p.m.

KCET

Sunday: The PBS affiliate offers an environmental block: The Unfolding Story, 2 p.m.; Water, 2:30 p.m.; Logging Sibera, 3:30 p.m.; Savior of the Forest, 4:30; Talking Trash, 6 p.m.; California’s Gold . . . With Huell Howser goes to the desert, 7:30 p.m.

Monday: David Attenborough’s Natural World, 8 p.m.; Eyewitness, 8:30 p.m.

Friday: The Search for Clean Air, 10 p.m.

NBC

The “Permanent Charities Earth Walk,� a consortium of environmental agencies (including Heal the Bay, Sierra Club, Tree People and American Oceans) will be discussed April 17-19 by The Tonight Show’s Jay Leno, who serves as the event’s chairman. The walk takes place Earth Day in Los Angeles.

NICKELODEON

On Earth Day: Nick rebroadcasts its popular Nick News Special Edition Earth Day shows: The Day the Earth Threw Up, 3 p.m., and Plan It for the Planet, 3:30 p.m.