Freight transport by air requires burning a lot of kerosine. Zeppelin drones are more energy efficient. There have been experiments with helium filled zeppelins but those are expensive because of the cost of helium. The first zeppelins where filled with cheap hydrogen gas. This is however dangerous because it is a highly imflammable gas. This is less of an issue for transporting cargo. Transporting cargo with autonomous hydrogen filled zeppelin drones is a great alternative for most conventional air freight.
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