MALAMA KA'ALA — Spend the day on Ka'ala summit with Army Natural Resource Program on weed control at the bog from 8 a.m.-4 p.m. Friday. Interpretive boardwalk hike to follow. Space limited; open to adults and children aged 13 and older with adult. Contact Kim Welch or Candace Russo at 656-7641 or e-mail kmwelch@hawaii.edu.

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

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. 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.

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

MANANA TRAIL CLEARING — Sierra Club and O'ahu Invasive Species Committee service project at 8 a.m. Nov. 10. Meet at trailhead at end of Komo Mai Drive, Pearl City. Bring hiking boots, long pants, rain jacket, water, lunch, hat and sunscreen. RSVP to 286-4616 or oisc@hawaii.edu.

HALEAKALA OVERNIGHTER — The Friends of Haleakala National Park will conduct a service trip Nov. 17-19 to weed heterothica at Crystal Cave washout area, with stay at Kapalaoa Cabin. Call 808-248-7660 for information and reservations.

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.

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