   
 | From the Editor's Desk
This cargo ship cuts emissions 90% using an old-fashioned trick: Sails Using sails to transport goods? An idea so old it's new again.
The tens of thousands of cargo ships that travel the world's oceans - carrying everything from jeans and smartphones to cars and bananas - collectively emit more CO2 than most countries. A new ship called the Oceanbird, in development now, is designed to help: With huge, wing-like sails, it runs on wind power, but will be able to cross the Atlantic in less than two weeks, only a few days longer than a ship running on fossil fuels.
For the shipping industry, which is racing to figure out how to cut emissions in line with the goals of the Paris climate agreement, the design has advantages compared to other potential solutions. Unlike cars, ships can't easily shift to electric power, since the massive size of a cargo ship means that it would need to be filled with batteries to run, leaving little room for cargo. Ships can run on liquified natural gas, but that would only partially reduce emissions. Ammonia fuel doesn't pollute as it burns but is polluting to produce. Wind energy can avoid all those challenges.
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