The County Board of Supervisors are set to vote tomorrow on three progressive green ordinances tomorrow that would affect unincorporated areas of Los Angeles County, some of which that are the most undeveloped (look northward to the Santa Clarita and Antelope Valley areas). The ordinances--green building, drought tolerant landscaping and low-impact development (LID)--would "be the singularly most progressive environmental action ever taken by the county and will set an impressive precedent for the entire region," writes Mark Gold, president of Heal the Bay, on his blog. But Gold is reserving excitement warning that the Building Industry Association is mobilizing to kill it.