Every approach to carbon removal is an answer to the same question: how do you move carbon from one place and form to another using the energy available to you? Plants solve this with extraordinary elegance. Banyu is attempting to do the same industrially — harvesting sunlight in the same reaction that moves CO2 from one sink (the ocean) into permanent storage and valuable end uses.

The dominant design architecture for carbon removal is sorbent or electrochemical based direct air capture that require vast amounts of power, either from new renewable buildout or from an already constrained and expensive grid. Banyu is a radical departure from that model, made possible by proprietary chemistry that generates a natural reaction to pull carbon out of the ocean. The result is a simpler, more elegant system with fundamentally different economics. At scale, it has the potential to reach cost and energy performance that other removal pathways cannot match.

Alex Gagnon was running experiments to cool coral reefs and protect them from acidification in Teti'aroa when the insight dawned on him. The planet already runs low-energy processes to move carbon between ocean and atmosphere at massive scale. If you could design an industrial process in the same vein it would inherit the same structural elegance. The ocean concentrates carbon; sunlight is free, everywhere; and, seawater already gets pumped at scale.

By applying the cheapest and most abundant energy source to one of the densest accessible concentrations of carbon dioxide, Banyu is building a planetary-scale carbon removal engine that scales what natural systems already do well - using sunlight to capture carbon and move it, with control, into permanent storage and returns broader forms of economic and planetary value. Rather than draining the systems it depends on, carbon removal can act as a strengthening force for biodiversity, electrification, optionality, and resilience.