Good question! Carbon removal is removing carbon dioxide from the atmosphere and storing it in a durable, ideally permanent, form. It's a nascent field, and several methods are being explored and developed, including natural or biological solutions (e.g. forests, soil), engineered systems (e.g. direct air capture, enhanced mineralization), and more
. Note that some technologies can play a role in carbon removal but are not, on their own, carbon removal systems — you can read more about this distinction in an article
we wrote. In some places carbon removal is referred to as "Carbon Dioxide Removal" or CDR. Also note that the phrase "Negative Emissions Technologies" or NETs is sometimes used to describe technologies that implement carbon removal.