WAIKIKI AQUARIUM DOCENTS — Free training for "Edge of the Reef" volunteer docents will be Sept. 4-20 (6:30-9 p.m. Tuesdays and Thursdays, 9 a.m.-noon Saturdays). Call 440-9020 or visit www.volunteer@waquarium.org.

CRATER TRIP — The Friends of Haleakala National Park will conduct a service trip Aug. 17-20 to paint Holua Cabin and weed heterothica. Call 808-248-7660.

HALEAKALA LEARNING TRIP — Join the Friends of Haleakala National Park for a service learning trip Sept. 1-3, with a two-night stay at Holua Cabin. Volunteers will work four hours a day and learn about the park's ecosystems from park staff.; $15 fee. Call 808-876-1673.

HONU GUARDIANS — Educate residents and visitors about turtle viewing at Laniakea by joining NOAA's Honu Guard program. For details, go to www.fpir.noaa.gov/PRD/prd_volunteer_opps.html.

WORM COMPOSTING — Learn vermicomposting basics in separate workshops at 9:30 a.m. tomorrow and 1 p.m. Aug. 19 at the Manoa Gardens Elderly Housing Community Center, 2790 Kahaloa Drive; $30, includes minibin, starter colony and manual. Contact 382-0432 or waikikiworm@hawaii.rr.com.

SIERRA CLUB BEER NIGHT — Hear presentations on environmental topics and how to get involved, at Cassis, 66 Queen St.: 5:30-7:30 p.m. Aug. 22, global warming update with Jeff Mikulina; 5:30-7:30 p.m. Sept. 26, curbside recycling with Betty Gearan.

POUHALA MARSH RESTORATION — The Hawai'i Nature Center needs volunteers to pull pickleweed and mangrove at the Waipahu marsh, 8:30-11:30 a.m. tomorrow. 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.

THURSDAY HELPERS — Kaua'i's Limahuli Garden & Preserve seeks volunteers to restore native forest on Thursdays, 8-11 a.m. Call Lahela Correa, 808-826-1053, or Lea Taddonio, 808-332-7324, ext. 228.

CHUN'S REEF CLEANUP - Join Adopt-A-Beach Hawaii and Save The Sea Turtles International at noon Aug. 25 for a Chun's Reef Beach highway and coastal cleanup. Trash bag, gloves and purified water provided; bring hat, sunscreen, beach shoes. Meet at 61-529 Kamehameha Highway, Hale'iwa. See www.seaturtlesinternational.com or call 637-2211.

ARBORETUM WORK PARTY — Lyon Arboretum in Manoa holds a volunteer work party at 8 a.m. on the first Saturday of each month. Meet in parking lot, prepared for rain and sun; closed-toe shoes, bug repellent, hat, gloves recommended.

NATURE CENTER WORKDAYS — Hawai'i Nature Center weekly volunteer workdays are held 10 a.m.-2 p.m. Saturdays at new location, 2131 Makiki Heights Drive; call 988-8995. Tasks include power-washing trailers, painting, planting.

NATURE LOVERS WANTED — Volunteers needed to staff the Waimea Valley Audubon Center information kiosk, surrounded by gardens, ponds and endangered water birds. Must commit to three hours per week through August. Call Kelly Perry at 638-9199.

PINE TREE PULLERS — Help remove invasive pines near Maui's Hosmer Grove, 9 a.m.-noon Sundays. Transportation provided at 7:30 a.m. from Harbor Shops, Ma'alaea, and 8:15 a.m. from Mayor Hannibal Tavares Community Center, Pukalani. Closed footwear required; bring water and lunch. Reserve space by calling 808-856-8341.

KOKUA HALEAKALA — Haleakala National Park needs volunteers for trail maintenance, visitor assistance, weed control, cultural demonstrations, library work and clerical help. Transportation from Makawao available. Apply at www.nps.gov/hale/supportyourpark/volunteer-opportunities.htm. Call 808-572-4487.

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