MALAMA KA'ALA — Spend the day on Ka'ala summit with Army Natural Resource Program on clidemia weed control from 8 a.m.-4 p.m. Friday. Short hike through dense forest required; gloves provided. Interpretive boardwalk hike to follow. Space limited; adults only. Contact Kim Welch or Candace Russo at 656-7641 or e-mail kmwelch@hawaii.edu.

NA POHAKU PROJECT — Work in a native plant garden off Kapa'a Quarry Road in Kailua on Saturday. Bring work gloves, water. Call for meeting time, place; Randy Ching, 942-0145; Ed Mersino 223-5765.

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

CRATER OVERNIGHTER — Stay over at Holua Cabin on a Friends of Haleakala National Park service trip to weed heterothica Oct. 20-22. Call 808-248-7660.

MAKE A DIFFERENCE DAY — Surfrider Foundation and Sierra Club are co-hosting a beach cleanup at Ala Moana Beach Park from 9 a.m.-12:30 pm. Oct. 27. Meet near entrance to Magic Island. Gloves, garbage bags, refreshments and post-cleanup barbecue provided. Deadline to register is Saturday; call Arlene Buchholz, 988-9806.

POUHALA MARSH RESTORATION — The Hawai'i Nature Center is restoring Pouhala Marsh in Waipahu. Volunteers are needed to pull pickleweed and mangrove, 8:30-11:30 a.m. Oct. 27. 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.

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

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.

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.

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.

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

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