ocr: Free-fire: zone, a creek bedi in the San Bernardino National Forest (right) is blighted by trash-become-targets, Beset by garbage, gridlock, and other urban ills, the forest is backyard to: 20 million Californians short on elbow room: - and forest etiquette. "Our visitors are: city folks who don't understand nature," says a recreation officer. "Why, I've seen people carry a couch from their truck down to the creek to set upa E living room!" Elsewhere int the forest, smog-stressed trees (below) frame al balcony view of shining San Bernardino. Yet it never came to that. Citizens com- Pinchot had ...