Greenhouse gasses occur naturally in a very cyclical and balanced way in nature:
The primary natural processes that release CO2 into the atmosphere (sources) and that remove CO2 from the atmosphere (sinks) are:
Animal and plant respiration, by which oxygen and nutrients are converted into CO2 and energy, and plant photosynthesis by which CO2 is removed from the atmosphere and stored as carbon in plant biomass;
Ocean-atmosphere exchange, in which the oceans absorb and release CO2 at the sea surface; and
Volcanic eruptions, which release carbon from rocks deep in the Earth’s crust (this source is very small).
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