Natural processes and human activities produce vast amounts of dead vegetation which return CO₂ to the atmosphere through decay and combustion. If such vegetation could be converted into biocoal and sequestered on the ocean floor, it could reduce the accumulation of atmospheric CO₂ without involving sequestration in the form of CO₂. Given that raw vegetation is unsuitable for large-scale energy applications, a process was developed to convert raw vegetation into a form of biocoal, termed Black Pellets, that solves the logistical and energy conversion problems of using raw vegetation for power generation. Seemingly overlooked is that properties of Black Pellets—higher density than seawater and resistance to microbial decay—may offer an environmentally safe way of sequestering vegetation carbon on the sea floor. Sequestering vegetation carbon by depositing biocoal as Black Pellets in the deep ocean (oceanic sequestration of biocoal—OSB) would be a means of achieving long-lasting negative emissions. Sacrificing the energy content of the deposited pellets would require substituting energy from other sources. If the substitute energy could be from lower-carbon natural gas or carbon-free sources, the effects would be less accumulation of atmospheric CO₂ compared to using the pellets for energy and a nearly 60 to 100% reduction in the need for geologic sequestration compared to bioenergy carbon capture and storage (BECCS). If confirmed by research, OSB would be an addition to the sparse toolbox of negative emission technologies (NETs) which would give humankind more flexibility in meeting the goals of the Paris Agreement.

自然过程和人类活动会产生大量枯死的植被，这些植被通过腐烂和燃烧将 CO ₂返回到大气中。如果这些植被可以转化为生物煤并被隔离在海底，它就可以减少大气中 CO ₂的积累，而无需以 CO ₂的形式进行隔离. 鉴于原始植被不适合大规模能源应用，开发了一种将原始植被转化为生物煤形式的工艺，称为黑颗粒，解决了使用原始植被发电的物流和能源转换问题。似乎被忽视的是，黑色颗粒的特性——比海水​​密度高，抗微生物腐烂——可能提供一种环境安全的方式来隔离海底植被碳。通过将生物煤作为黑色颗粒沉积在深海（生物煤的海洋封存 - OSB）来封存植被碳将是实现长期负排放的一种手段。牺牲沉积颗粒的能量含量将需要从其他来源替代能量。₂与使用颗粒作为能源相比，与生物能源碳捕获和储存 (BECCS) 相比，地质封存的需求减少了近 60% 至 100%。如果研究证实，OSB 将是负排放技术 (NET) 稀疏工具箱的补充，这将使人类在实现《巴黎协定》的目标方面具有更大的灵活性。