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Drones that fly packages straight to people's doors could be an environmentally friendly alternative to conventional modes of transportation.Greenhouse-gas emissions per parcel were 84% lower for drones than for diesel trucks.Drones also
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/cdn.vox-cdn.com/uploads/chorus_asset/file/14546460/prime-air_high-resolution02.1419980131.jpg "Here are the three things Amazon needs to get its delivery drones off the ground - The Verge")
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