BIG ISLE COMPOSTING — Learn how to compost green waste and kitchen scraps from 4-6 p.m. Wednesday at Volcano School of Arts and Sciences, and from 1-3 p.m. Saturday at University of Hawai'i Komohana Extension; $10 fee, kids free. Space limited; register by e-mailing piper@hawaiirainbowworms .com or call (808) 937-2233.

ALA WAI CLEANUP — The Sierra Club will clear debris from the Ala Wai Small Boat Harbor on Saturday. Meet at 8 a.m. at the harbor master's office. Bring sturdy shoes, hat, thick rubber gloves, sunscreen, water. Call Deborah Blair at 955-4168.

POUHALA MARSH — The Hawai'i Nature Center is cleaning and restoring the wetland habitat in Pearl Harbor. Volunteers are needed to pull pickle weed and mangrove 8:30-11:30 a.m. Saturday. Bring work gloves, water, hat, sunscreen, towel and change of clothes; covered footwear and long pants required. Contact Pauline Kawamata at 955-0100, ext. 18, or paulinekawamata @aditl.com.

REEF CHECKERS — Volunteers are needed Saturday to check out what's happening with the reef at the Natatorium. Training scheduled for today and Wednesday. For information, e-mail melissa@reefcheck .org.

WORM COMPOSTING — Learn the basics of vermicomposting at 9:30 a.m. Saturday at Honolulu Waldorf School, Niu Valley; $30 fees includes mini bin, starter colony and manual. 382-0432 or waikikiworm@hawaii .rr.com.

NATIVE FOREST PLANTING — The Maui Dryland Forest Restoration Group will go on a planting trip to the Auwahi native forest enclosure March 25; meet at 'Ulupalakua Ranch Store. Hiking boots required; bring rain gear, water, lunch, sunscreen, hat. Register by e-mailing auwahi@yahoo.com or call (808) 572-4471.

SOUTH POINT CLEANUP — A marine debris cleanup will be held March 25 at South Point, Big Island. Meet at 8 a.m. at Wai'ohinu Park for shuttles; bring hats, sturdy footwear, sunscreen and lunch; transportation, water, toilets and gloves provided. Call (808) 756-1808.

WHALE COUNT — The Hawaiian Islands Humpback Whale National Marine Sanctuary needs volunteers March 25 to count whales over a four-hour period at 65 sites on three islands. To register, call (888) 559-4253, ext. 253, on the Big Island; (808) 246-2860 on Kaua'i; or 397-2651, ext. 253, on O'ahu.

WEED WARRIORS — Student volunteers age 14 and older can help Maui Invasive Species Committee survey and control invasive weed populations, learn scientific protocol and aid conservation efforts. Search for ivy gourd on March 25 and catch coqui frogs March 28. Reservations and parental approval required. Contact Shannon Wianecki at (808) 573-6472 or hoikeinfo@yahoo.com.

KANAHA RESTORATION — Volunteers are needed daily for brush removal, rubbish pickup, planting and watering at Maui's Kanaha Beach Park. Contact Community Work Day at (808) 877-2524, cwdkhb@pixi .com or www.hear.org/naturalareas /kanahabeach.

KONA MULCH GIVEAWAY: Free mulch is available at the Kealakehe/ Kona Transfer Station's green waste area, 6:30 a.m.-6:30 p.m. daily; bring pitchfork. Loading assistance is provided from 7 a.m. to 4 p.m.

Send listings to: For the Environment, P.O. Box 156, Wailuku, HI 96793; cwilson@honolulu advertiser.com; or fax (808) 242-1520.