Why cargo ships might (literally) sail the high seas again

There's something inherently romantic about the great ships of yore: Those massive sails piercing the sky above an endless horizon.

These days, of course, we've given up the sails for the brute force of fossil fuel engines. The modern shipping industry has sacrificed elegance — not to mention the environment — for volume, speed, and efficiency.

But those old sails may be coming back.

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