Chevron Corp, which is in the throes of a multibillion-dollar pollution lawsuit in Ecuador, has asked courts there to disregard an environmental expert who has said the company should pay $27 billion in damages for polluting the Amazon rain forest. In a filing to the Lago Agrio court on Friday, Chevron said it was seeking the dismissal of geologist Richard Cabrera as an appointee and the rejection of his work in its entirety…Chevron claims Cabrera violated his legal duties by working directly with the plaintiffs' lawyers and consultants. Plaintiffs said Cabrera was acting appropriately when he sought information from people on both sides of the lawsuit, and that Chevron chose not to participate in the process.