All events are free unless otherwise indicated.

COMING UP

"MARINE DEBRIS," lecture by Suzanne Frazer, co-founder of the Beach Environmental Awareness Campaign Hawai'i, part of the monthlong Marine Debris Awareness Month lecture/film series; 6:30-7:30 p.m. Oct. 16; Hanauma Bay theater; free; 393-2168 or www.b-e-a-c-h.org.

POUHALA MARSH RESTORATION, project by Hawai'i Nature Center to remove invasive species and create habitat areas for endangered Hawaiian stilts; 8:30-11:30 a.m. Oct. 18; at the center; bring work gloves and drinking water, wear a hat, sunscreen and covered-toe shoes, and expect to get dirty and muddy; contact Pauline Kawamata at volunteer@hawaiinaturecenter.org or 955-0100, ext.18.

HOME RAIN BARREL CATCHMENT SYSTEM WORKSHOP, taught by environmental engineer Jeremai Cann, 10 a.m.-noon Oct. 18; The Green House, 224 Pakohana St., Pauoa Valley; $15; required registration, 524-8427, www.thegreenhousehawaii.com.

NATURAL GREEN CLEANING WORKSHOP, on simple cleaning recipes, 10 a.m.-noon Oct. 18; The Green House, Pauoa Valley; $15; required registration, 524-8427, www.thegreenhousehawaii.com.

GRAYWATER HARVESTING WORKSHOP, taught by environmental engineer, Jeremai Cann, on reusing water drained from baths, showers, washing machines and sinks to irrigate, 1:30-3:30 p.m. Oct. 18; The Green House, Pauoa Valley; $15; required registration, 524-8427, www.thegreenhousehawaii.com.

SIERRA CLUB 'ONIKINIKI HIKE, 6-mile, "moderate" hike in Waimalu, featuring native sandalwood trees; Oct. 19; required reservations /time/starting point: Ed Meersino, 223-5765.

BE A GREENIE

Niaulani Forest Work Day: Volunteer to preserve the beauty and diversity of the rainforest; 9 a.m.-12 p.m. third Sunday of each month; Volcano Art Center, Niaulani campus; free; 808-967-8222.

Niaulani nature walk, guided tour through an old-growth forest; 9:30 a.m. Mondays; from Volcano Art Center, Niaulani campus, Volcano Village, Big Island; 808-967-8222, www.volcanoartcenter.org.

TUESDAYS AT KANAHA, weekly beach cleanup and plant maintenance, coordinated by Community Pride at Kanaha Beach Park, Maui; 8-10 a.m. Tuesdays; at the park; Valerie Vines Magee, 808-264-1454.

GREEN DRINKS, an informal networking group of people who work in the environmental field, active in 311 cities worldwide; 5-9 p.m. first Tuesday of each month; E&O Trading Co., Ward Centre; 351-2891.

WEED AND POT CLUB: Maui Nui Botanical Garden's Weed & Pot Club meets 8:30-10:30 a.m. Wednesdays, 150 Kanaloa Ave., Kahului, Maui, to perform beautification and maintenance work; tools, gloves and drinking water provided; wear shoes; 808-249-2798.

MAKIKI FOREST RESTORATION PROJECT, the O'ahu Na Ala Hele Trails and Access program and Hawai'i Nature Center need volunteers to weed, pick up branches, plant, water and fertilize native plants as part of Makiki Watershed Awareness Initiative forest restoration project. Bring long pants, long-sleeved shirt, shoes or boots, gloves, insect repellent, water and lunch; families welcome; 9 a.m.-2 p.m. fourth Saturday of each month; meet at Makiki forestry baseyard, above new Hawai'i Nature Center (from Makiki Street, take a left onto Makiki Heights Drive; the area entrance is before first hairpin turn); 973-9782.

Send announcements, with contact name and phone number, to: For the Environment, Island Life, The Advertiser, P.O. Box 3110, Honolulu, HI 96802; or islandlife@honoluluadvertiser.com, with "For the Environment" in the subject line. Deadline is 10 days before the event.