<i>Today’s airship designers share a vision: magnificent amounts of trucking going on in the sky—regular convoys of enormous airships carrying timber, coal, wind turbines, prefabricated homes, or an entire summer harvest, puttering gently along at about a hundred miles an hour, ten thousand feet over our heads.</i><p>So, airships are the next container ships? Sounds intriguing. Do they emit less CO2 per mile than the container ships?