Ocean Alkalinity Enhancement

Ocean alkalinity enhancement is the Marine Carbon Removal approach in An "antacid" to fight climate change that adds or exposes alkaline materials so seawater can chemically store more CO2 as bicarbonate. The episode explains the idea through Vesta’s olivine field demonstration near Duck, North Carolina.

The concept matters because it reframes Carbon Removal as an ocean-chemistry and monitoring problem, not only a machine-capture problem like Direct Air Capture. Adam Subhas says the approach accelerates a natural geological process, but the source keeps the claim experimental until scale, speed, tradeoffs, and marine-life effects are better understood.

Key Claims

• The method aims to increase the ocean’s capacity to store CO2 by shifting dissolved carbon toward bicarbonate.
• Olivine Carbon Removal is one mineral-specific version, using olivine as the alkaline material.
• Field demonstrations require ocean-chemistry sampling because the claimed carbon storage is indirect and distributed.
• The method could pair with coastal restoration only if monitoring shows minimal harm to marine life.
• The episode treats the technology as promising but unresolved, with Carbon Storage Permanence, Carbon Removal Cost Curve, and ecological tradeoffs still open.

Connections

• Vesta, Hourglass Climate, Jacqueline Sentiner, Woods Hole Oceanographic Institution, and Adam Subhas - project and expert context.
• Olivine Carbon Removal, Marine Carbon Removal, and Carbon Removal - technology category.
• Ocean Acidification and Carbon Storage Permanence - chemistry and accounting context.
• Climate Startup Commercialization Gap, Economic Climate Tech Adoption, and Carbon Removal Moral Hazard - deployment and legitimacy frame.