Eliminate regulations that require that parking lots be paved with asphalt or concrete. A few parking spaces should be paved smooth for handicap accessibility, but the other spaces should be covered with gravel. It would provide a substrate with high surface area for biodegration of oils that drip from vehicles. It would also slow down storm water runoff, and promote groundwater recharge. For examples of what this would look like, see Heifer Project or Garvan Woodland Gardens.