Trees along Locust Street, between Civic Drive and Bonanza Street, in downtown Walnut Creek, Calif., photographed on Tuesday, March 25, 2014. Cities across the Bay Area are joining together to try and stop a plan by Pacific Gas and Electric that will call for the cutting down of thousands of trees like these. PG&E says the cutting down of trees is necessary to make their gas pipelines safer. Many city leaders are saying that the utility is violating local tree removal ordinances. (Dan Honda/Bay Area News Group)