Correction to: Nature Plants https://doi.org/10.1038/s41477-022-01305-9. Published online 23 December 2022.

In the version of this article initially published, in the Results subsection “Costs and benefits of large-scale seaweed farming”, the percentages of ocean area farmed to reach 1 Gt and 3 Gt of CO2 sequestered by sinking seaweed in the ambient nutrient scenario were incorrect due to typographical errors. As a result, in the sentence beginning “In the optimistic case”, “0.85%” is now “0.110%”, “310,000 km2” is now “400,000 km2”, and “Poland” now reads as “Zimbabwe”. In the sentence following, “is slightly higher: 0.036% and 0.099%” now reads as “is 0.035% and 0.100%” and “$40” is now “$30”. Furthermore, in the penultimate sentence of this paragraph, “ocean areas of 0.09–0.10% and 0.28–0.37%” now reads as “ocean areas of 0.085–0.100% and 0.285–0.410%” and “roughly 320,000–360,000 km2 and 1,010,000–1,330,000 km2” is now “roughly 310,000–360,000 km2 and 1,030,000–1,480,000 km2”. Calculated values in this subsection have been revised to reflect these corrections: in the sentence beginning “Average costs at the median of Monte Carlo”, “$1,110–$2,100” is now “$1,120–$2,090”; and in the paragraph beginning “Despite being a small percentage”, “17%” is now “18%” and “61%” is now “64%”. Corresponding values in the Methods subsection “Comparison of gigaton-scale sequestration area to previous estimates” and in Supplementary Figures 10 and 11 have been updated accordingly. The errors have been corrected in the HTML and PDF versions of the article.