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Our oceans contain about 40,000 Giga tons of C in the form of CO2, compared to atmosphere (600 GT), vegetation (700 GT), soils (1600 GT) and accessible fossil fuels (about 1600 GT); oceans thus contain almost 10 times the CO2 of all others combined!
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Oceans are the largest ‘carbon sink’ – a vital buffer against the impacts of climate change as it absorbs 25 percent of all carbon dioxide emissions and captures 90 percent of the excess heat generated by these emissions.
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https://www.un.org/en/climatechange/science/climate-issues/ocean
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The ocean holds 60 times more carbon than the atmosphere and absorbs almost 30% of carbon dioxide (CO?) emissions and acts as a key to the global carbon cycle.
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The oceans could ultimately absorb around 95 per cent of the anthropogenic emissions.Sub-seabed sequestration of CO2 involves transferring captured CO2 and storing it long-term in marine sub-seabed geologic formations.
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https://worldoceanreview.com/en/wor-1/ocean-chemistry/co2-reservoir/