Winds of change: the sailing ships cleaning up sea transport

They fan out across the seas like a giant maritime dance, a ballet of tens of thousands of vessels delivering the physical stuff that has become indispensable to our way of life: commodities and cars, white goods and gas and grains, timber and technology.

But shipping – a vast industry that moves trillions of pounds-worth of goods each year – is facing an environmental reckoning. Ships burn the dirtiest oil, known as bunker fuel; a waste product from the refinery process, literally scraping the bottom of the barrel, the crud in crude. It’s so thick that you could walk on it at room temperature.

As a result, shipping is a major polluter – responsible for about 2.5% of global carbon emissions. Not surprisingly, innovators are starting to wonder if there