(Seattle, WA)  --  Research conducted at the University of Washington shows delivering packages with drones can help reduce carbon emissions, compared to delivery by truck.  The analysis compares carbon-dioxide emissions and vehicle miles traveled from drone and truck deliveries in nearly a dozen different, real-life scenarios in Los Angeles.  The research shows the benefits of drone delivery are most evident when small packages, such as a bottle of medicine or a child's bathing suit, are delivered.  It also helps when the drone doesn't have to travel far to its destination.