Ocean Carbon Capture: Miracle Cure or Risky Experiment?

Ocean engineering firms are actively developing methods to remove atmospheric carbon dioxide, a key driver of the climate crisis. Companies like Planetary Technologies are employing ocean alkalinity enhancement (OAE), a process that involves adding a chalk-like substance to seawater. This allows the ocean to absorb and store more carbon while also mitigating ocean acidification, a serious consequence of increased atmospheric CO2.

While proponents assert that OAE mimics natural processes and poses no threat to marine life, some scientists advocate for more research, comparing the current stage to an immediate clinical trial. This burgeoning industry has attracted over $500 million in investments since 2021. The International Maritime Organization (IMO) has adopted a framework acknowledging OAE and other ocean carbon removal techniques, emphasizing the need for further scientific study before large-scale deployment.

Canada, particularly Nova Scotia, has emerged as a significant hub for ocean alkalinity enhancement, hosting multiple companies and research initiatives. However, the rapid growth of this field raises regulatory questions, with concerns about applying existing maritime laws and the potential for exploitation by bad actors. Additionally, the origin and composition of the materials used for OAE are being scrutinized for potential trace metal toxicity to marine ecosystems.

Despite ongoing scientific debate and calls for caution regarding environmental impacts, industry leaders argue that delays in scaling up carbon removal solutions are detrimental given the urgency of the climate crisis. They contend that the ocean is already being damaged and that proactive measures are essential, even if they involve novel interventions.