Actress and environmental activist Julia Louis-Dreyfus is campaigning against a plan to restart a pipeline in California that previously caused a significant oil spill in 2015. The pipeline, potentially backed by Exxon, is being called the 'single largest threat to California's coast.' Louis-Dreyfus is actively involved in raising awareness and advocating against the pipeline's reactivation, citing the potential for further environmental damage and the need to protect the state's coastal ecosystem.