According to the WeForum website, direct air capture — a method in which carbon dioxide is pulled out of the air and, in some cases, turned into rock — has several already-working models. If anything, it sounds like researchers are basically working out on how to reduce costs on any of the methods currently used for CO2 absorption.
Climeworks and Global Thermostat have piloted systems in which they coat plastics and ceramics, respectively, with an amine, a type of chemical that can absorb CO2. Carbon Engineering uses a liquid system, with calcium oxide and water. The companies say it’s too early in the development of these technologies to predict what costs will be at scale. “It’s like if you asked someone in 1960 what the cost of commercial rockets would be today,” says David Keith of Carbon Engineering. What they are willing to share are cost targets.
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