Drone Vs. Truck Carbon Emission Heat Map (IMAGE) University of Washington Caption These heat maps show carbon dioxide emission differences between drone and truck deliveries as a drone's energy requirements (measured in watt-hours per mile) and the number of stops on a route increase. Red areas reflect conditions in which drones emit less carbon dioxide than trucks (lighter packages, fewer stops), while blue areas denote conditions in which drones emit more (heavier packages, more stops). Credit University of Washington Usage Restrictions With credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.