Originally posted by TimberWolf
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CO2 dissolves in the sea.
Molluscs use the dissolved CO2 to make shells.
Molluscs die and form thick sea beds of chalk.
Tectonic plates move and the sea bed gets shoved under the adjoining plate.
As the chalky stuff hits the mantle, some gets squirted out of volcanoes as CO2 in huge quantities.
--- BUT, then photosynthesis and green plants came along and the atmosphere was very suddenly swept of its CO2 (causing a massive genetic destruction) and the rules changed:
Green plants suck the CO2 out of the air to make their bodies.
Green plants die and form thick layers of peat.
This keeps being squashed by more peat or even stuff that becomes rock and the dead plants become gas and oil and coal.
Tectonic plates move and the sea bed gets shoved under the adjoining plate.
As the carbon rich peat / gas / oil / coal hits the mantle, some gets squirted out of volcanoes as CO2 in immensely huge quantities.
--- ALSO
Carbon dioxide is also released produced by forest fires but this is fairly irrelevant and is "carbon neutral". It was plants and it becomes plants.
--- ALSO
Critters breathing out produces CO2. This is from food that was plant matter or animals that ate plant matter and will become plants again and so it "carbon neutral".
What has changed all this is that we are taking all the peat, coal, oil and gas we can find and shoving it into the atmosphere as quickly as we can. Personally, I think this is stupid because I do not believe we should destroy one-use-only fossil fuels for use as heating or transport fuel. It should be used to make things. Simply burning it is wasteful madness, regardless of the environmental impact.
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