Yale Environment 360: Twenty years ago when an epic clash over the logging of ancient redwood forests roiled California, the battle lines were clear-cut. On one side stood a Texas corporate raider who acquired the Pacific Lumber Co. in a junk bond-fueled takeover and began felling vast swaths of primeval redwoods to pay off the debt. On the other side was Earth First! and other grass-roots greens who staged a campaign of civil disobedience to disrupt the logging. And while mainstream environmental groups …