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The Earth’s surface area is about 70% percent covered by water.
More than 95 percent of the water is in the oceans, and they make up less than 1 percent of the Earth’s total volume.
If you go by mass instead of volume the fraction is even lower.
it most certainly IS carbonated though.
Yes, but the concentration of CO₂ is about 420 ppm from 2023 measurements. Whereas your average carbonated soda is around 10,000 to 15,000 ppm. And most people call anything below 2,000 ppm flat.
Something to consider.