Just as there are lots of ways to add CO2 to the air, there are lots of ways—potentially—to remove it. A technique known as “enhanced weathering” is a sort of upside-down version of the project I toured at the Hellisheiði Power Station. Instead of injecting CO2 deep into rock, the idea is to bring the rock up to the surface to meet the CO2. Basalt

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But it’s one thing to be able to pull carbon out of the air and quite another to be able to pull this off at scale. Burning fossil fuels generates energy. Capturing CO2 from the air requires energy. So long as this energy comes from burning fossil fuels, it will add to the carbon that has to be captured. A second major challenge is disposal. Once c

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Carbon dioxide removal may be essential; it’s already built into the calculations of the IPCC. Under the current order, however, it’s also economically infeasible. How do you go about creating a $100 billion industry for a product no one wants to buy? The eggplants and the Snack-Gurken represented an admittedly jury-rigged solution. By selling its

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