The 20th Century was the century of Aviation and the century of Globalization. The next century will be the century of Space.
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Shipping is the greenest method of transport. In terms of carbon emissions per ton per mile, it emits about a thousandth of aviation and about a tenth of trucking. But it's not benign, because there's so much of it. So shipping emissions are about three to four percent, almost the same as aviation's.