As soon as there were drones, there were visions of drone deliveries. Robotic insects bringing parcels and pizzas to your front or back doorstep in a jiffy, not waiting for traffic lights and traveling as the crow flies. But as aviation regulators around the world work with the likes of Amazon, UPS and DHL to clear a legal pathway for these kinds of services to begin, a new study out of Germany points out that the high energy cost of flying drones could make them worse for the environment than vans.
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