[Reeses]

Water vapor ... serves mostly to keep the average temperatures moderated to within a relatively narrow range.

Earth's surface chemistry is also heavily buffered by the 100 tons of diverse living biomass per human. If the chemistry shifts just a little, such as CO2 increasing 0.01% over 100 years, slight increases in plant growth will beat it back down.

[editor-surveyor]

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>> “If the chemistry shifts just a little, such as CO2 increasing 0.01% over 100 years, slight increases in plant growth will beat it back down.” <<

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The phyto plankton in the top half inch of the ocean will deplete it long before land based plants get a crack at it.

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