Mitigating human contributions to climate change is a highly debated topic, as it becomes evident that many nations do not adhere to optional reductions in global emission. Substantial research is taking place into negative carbon technologies that actively reduce the amount of atmospheric carbon dioxide (CO₂) via greenhouse gas removal (GGR). Various GGR methods have been proposed, from reforestation to ocean fertilisation. This article discusses advantages of an approach based on enhanced input of tephra to the ocean, to increase the drawdown of atmospheric CO₂. Natural addition of tephra to the ocean results in preservation of enhanced organic matter in sediment. Hence, augmenting its delivery should raise the level of sequestration. Calculations indicate that offshore tephra addition could sequester 2750 tonnes of CO₂ per 50,000 tonnes of ash delivered (a typical bulk carrier’s capacity). The cost is estimated as ∼$55 per tonne of CO₂ sequestered and is an order of magnitude cheaper than many proposed GGR technologies. Further advantages include: tephra addition is simply an augmentation of a natural Earth process, it is a low technology approach that requires few developments, and it may sequester carbon for thousands of years. Hence, offshore tephra addition warrants further investigation to assess its viability.

减轻人类对气候变化的贡献是一个备受争议的话题，因为很明显，许多国家并未坚持选择减少全球排放量。负碳技术正在进行大量研究，这些技术通过温室气体去除（GGR）积极减少了大气中的二氧化碳（CO ₂）含量。从造林到海洋施肥，已经提出了多种GGR方法。本文讨论了一种基于增强的特菲拉向海洋输入以增加大气CO ₂降落量的方法的优势。将特非拉自然添加到海洋中可以保留沉积物中增强的有机质。因此，增加其交付量应提高隔离水平。计算结果表明，每添加50,000吨灰分（典型的散货船运力），添加近海提夫拉可以封存2750吨CO ₂。估计成本为每吨隔离的CO ₂约55美元，比许多拟议的GGR技术便宜一个数量级。进一步的优势包括：添加特菲拉仅仅是对自然地球过程的增强，这是一种技术含量低的方法，几乎​​不需要开发，并且可以将碳封存数千年。因此，近海提夫拉的添加值得进一步研究以评估其生存能力。