“Of Enron Corp.’s many political maneuvers in Washington before its fall into bankruptcy, winning the promise of federal financing for a 390-mile pipeline from Bolivia to Brazil through the Chiquitano Dry Tropical Forest may have the most enduring consequences. … The pipeline, completed late last year, and its service roads have opened the forest to the kind of damage environmental groups had predicted: Poachers travel service roads to log old-growth trees. Hunters prey on wild game and cattle graze illegally. An abandoned gold mine reopened and its workers camp along the pipeline right-of-way.”