The thousands of cargo ships that are used to deliver everything from your next pair of jeans to your car emit around a billion metric tons of CO2 each year. Cleaner shipping fuel and innovations like modern sails will take time to scale up. One startup is working on a solution that could tackle the problem faster. The company, called Calcarea, captures CO2 from a ship’s exhaust and converts it into salty water that can safely be returned to the ocean as the ship sails.

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