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Travertine built an electrochemical process that permanently converts carbon dioxide into a mineral while simultaneously producing sulfuric acid–the world’s most produced chemical–for use in critical element extraction and fertilizer production. “One of the key motivators of Travertine is taking one of the major waste products that humans make, which is sulfate waste, and trying to turn them back into something valuable to help promote this clean energy transition.” — Laura Lammers, PhD, founder and CEO of Travertine. Frontier is an advance market commitment (AMC) that aims to accelerate the development of carbon removal technologies by guaranteeing future demand for solutions like the one Travertine is building. It’s funded by Stripe, Alphabet, Shopify, Meta, McKinsey, and tens of thousands of businesses using Stripe Climate. Climate models project that by 2050 we will need to permanently remove billions of tons of CO₂ from the atmosphere every year.