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implications for their ability to access CO₂ for photosynthesis. CO₂ diffuses 10,000 times slower in water than in air, and is also slow to equilibrate. The result of this is that water, as a medium, is often easily depleted of CO₂ and is slow to gain CO₂ from the air. Finally, CO₂ equilibrates with bicarbonate when dissolved in water, and does so on a pH-dependent basis. In sea water for example, the pH is such that dissolved inorganic carbon (DIC) is mainly

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