Presented by the Chicago Rainforest Action Group, the Rainforest Film Festival will run from Saturday, October 21, through Sunday, October 29. Screenings will be held at the Brookfield Zoo Discovery Center, 8400 W. 31st St., Brookfield; the Chicago Academy of Sciences, 2001 N. Clark; the Columbia College Hokin Center, 623 S. Wabash; Facets Multimedia Center, 1517 W. Fullerton; and the University of Chicago, 1212 E. 59th St. All the screenings are free, except for those at Facets Multimedia and the University of Chicago. For more information call 666-3305.

BANKING ON DISASTER Adrian Cowell’s three-part documentary feature about the destruction of the Amazonian rain forest (1987). (Columbia College Hokin Center, Wednesday, October 25, 4:00)

BLOWPIPES AND BULLDOZERS Jeni Kendell and Paul Tait’s Australian film about the Penang tribe of Sarawak, Malaysia, and the shrinking forests of Borneo. On the same program, Rainforest Rap, a U.S. short. (Columbia College Hokin Center, Tuesday, October 24, 4:00)

THE GREEN WALL This Peruvian back-to-the-land (or, more accurately, back-to-the-jungle) drama became a minor cult item after its exposure at the 1970 Chicago International Film Festival. The director, Armando Robles-Godoy, is entirely innocent of technique, but his sincere fumblings give the cliche theme some charm. (DK) Shown in conjunction with the Chicago International Film Festival. (Univ. of Chicago, Saturday, October 2l, 6:00)

IRACEMA A Brazilian-West German coproduction, banned in Brazil, about an Indian girl, Iracema (the name is an anagram for “America”), who travels the Trans-Amazonian Highway in search of her share of Brazil’s new riches. Jorge Bodansky and Wolf Gauer directed, in what would seem to be a combination of the Brazilian cinema’s allegorical bent with the New German Cinema’s romantic nihilism. With Edna de Cassia and Paulo Cesar (1975). (DK) (Facets Multimedia Center, Monday through Thursday, October 23 through 26, 7:00 and 9:00)

KAYAPO INDIANS AT ALTAMIRA GATHERING Also known as Kayapo: Out of the Forest, this is a new British documentary by University of Chicago anthropologist Terrence Turner about a confrontation between native tribes and the Brazilian government over the building of a dam. Turner will introduce the film and answer questions after the screening. (Chicago Academy of Sciences, Monday, October 23, 7:30)

RAINFOREST A National Geographic documentary that explores the ecology of a Costa Rican tropical fain forest (1983). On the same program, Our Threatened Heritage, a National Wildlife Federation video. (1988). (Brookfield Zoo Discovery Center, Sunday, October 22, 11:00 am)

A 20TH CENTURY MEDICINE MAN WBBM TV anchorman Bill Kurtis, who will introduce this 50-minute U.S. documentary, explores with ethnobotanist Mark Plotkin and the use of rain-forest plants as potent medicines in the jungles of Suriname. (Brookfield Zoo Discovery Center, Thursday, October 26, 7:00)