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What happens to all the CO₂ that’s released into the air? Plants and phytoplankton absorb a lot of that CO₂ for photosynthesis, the process they use to make food for themselves. In photosynthesis, plants and phytoplankton “breathe in” CO₂ and breathe out oxygen (O₂).
Some of the carbon in CO₂ gets incorporated into the body of the plant. We can think of forests as big storage tanks of carbon. In fact, forests are the largest carbon sinks on land.