On this episode of the Changing Waters podcast, host Brad Warren speaks with Dr. Greg Rau of Planetary Hydrogen about using ocean chemistry to capture and store CO2, the toolkit for ocean carbon removal options, and why Greg thinks that the abiotic, natural chemistry of the ocean shows particular promise. Planetary Hydrogen is upending the global hydrogen market with the first scalable, truly carbon-negative form of hydrogen production. Their process converts greenhouse gases directly out of the air into an antacid for oceans damaged by climate change. This Ocean Air Capture (OAC) system is the first to be able to both remove the carbon dioxide that is causing climate change and to restore ocean chemistry.