On 14 November, I toured a delivery container bristling with tubes and wires, perched beside New York Metropolis’s East river. It’s the check website of a start-up referred to as Vycarb, which just lately started including crushed rocks and different chemical substances to the water to take away carbon dioxide from the ambiance.
On one facet of the container, an hourglass-like gadget blended a superb stream of calcium carbonate mineral powder with water pumped from under. This alkaline, grey-green slurry was then launched into an…