Sitting on top of a waste incineration facility near Zurich, a new carbon capture plant is now sucking CO2 out of the air to sell to its first customer.

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The plant, which opened on May 31, is the first commercial enterprise of its kind. By midcentury, the startup behind it–Climeworks–believes we will need hundreds of thousands more. To have a chance of keeping the global temperature from rising more than two degrees Celsius, the limit set by the Paris agreement, it’s likely that shifting to a low-carbon economy won’t be enough.

Removing carbon–whether through planting more forests or more advanced technology like direct carbon capture–will probably also be necessary to reach the goal.

At the new Swiss plant, three stacked shipping containers each hold six of Climeworks’ CO2 collectors. Small fans pull air into the collectors, where a sponge-like filter soaks up carbon dioxide. It takes two or three hours to fully saturate a filter, and then the process reverses: The box closes, and the collector is heated to 212 degrees Fahrenheit, which releases the CO2 in a pure form that can be sold, made into other products, or buried underground.

“One CO2 collector has the same footprint as a tree,” says Wurzbacher. “It takes 50 tons of CO2 out of the air every year. A corresponding tree would take 50 kilograms of the air every year. It’s a factor of a thousand. So in order to achieve the same, you would need 1,000 times less area than you would require for plants growing.” The CO2 collectors can also be used in areas that wouldn’t be suitable for agriculture, helping preserve land needed for farming, and they don’t require a water source, unlike some afforestation efforts. They can also run on renewable energy.

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