cocoa-butter
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Circe
Circe (Circe Bioscience) is a Boston-based climate biotech company that engineers microbes to eat carbon dioxide and build valuable molecules - fats, oils, sugars, plastics and fuels - using only CO2, water and electricity. Spun out of Harvard's Wyss Institute in 2021, its gas-fermentation platform consumes roughly 3 kilograms of CO2 for every kilogram of oil it produces, making the process carbon-negative. The company has made the world's first chocolate using fermentation-derived cocoa butter and, in September 2024, raised a $5M seed round to open a pilot plant in Waltham, Massachusetts.
Kathleen Alexander
Kathleen Alexander is co-founder and CEO of Savor, a San Jose-based food-tech startup that makes butter, palm oil, and cocoa butter alternatives from carbon dioxide, hydrogen, and oxygen - no animals, no plants, no farmland. Backed by Bill Gates' Breakthrough Energy Ventures and Synthesis Capital with $33 million raised, Savor commercially launched its carbon-synthesized butter in March 2025 and was recognized in TIME's Best Inventions of 2025. Alexander holds a PhD in Materials Science & Engineering from MIT and is a 2013 Hertz Fellow who grew up in Corvallis, Oregon - famously starting college at 16, dropping out, attending community college, and ultimately earning her doctorate at MIT.