Ethically minded entrepreneurs are turning back the clock to sweep the scourge of bunker fuel from the oceans. The owners of Fairtransport were inspired to revive sail cargo after witnessing at first hand the yellow smog caused by commercial vessels. They restored two ships, a 70-year-old minesweeper renamed the Tres Hombres and a wooden ketch called Nordlys that dates back to 1873. THE GUARDIAN