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| Name | Current message text |
|---|---|
| h English (en) | These options focus on the carbon which ocean reservoirs can store. They include [[ocean fertilization]], [[ocean alkalinity enhancement]] or [[enhanced weathering]].The IPCC found in 2022 ocean-based mitigation options currently have only limited deployment potential. But it assessed that their future mitigation potential is large. It found that in total, ocean-based methods could remove 1–100 Gt of {{CO2}} per year. Their costs are in the order of US$40–500 per tonne of {{CO2}}. Most of these options could also help to reduce [[ocean acidification]]. This is the drop in pH value caused by increased atmospheric CO<sub>2</sub> concentrations. |