[Ben Ficklin]

Water vapor condenses, CO2 doesn't. So, water vapor is part of the hydrologic cycle, which like the carbon cycle, can be complicated, especially when the hydrologic cycle and the carbon cycle intertwine.

If water vapor condenses, falls as rain, absorbed by the soil, taken in by a plant's roots to combine with the carbon the plant took from the atmosphere to create things like cellulose and lignin, which if burned/decomposed, release CO2 and water vapor to the atmosphere.

It could be a plant that grew in the spring then burned in the summer or a plant that grew in a far back geologic period, was stored in the earth, mined, then burned to generate electricity.

[GilesB]

But the statement that CO2 is the chief greenhouse gas is pure bushwah. The chief greenhouse gas is water vapor - period.

The whole “carbon footprint/global warming” chicken little screeching is getting very tiresome.

The Algores are like flies that have a one day life cycle, panicked about the sun dying as evening falls.

[Olog-hai]

Water when it falls as rain takes CO₂ with it. That is why rain has an average pH of 5.6, bringing the carbon from the CO₂ back into the soil and into the plants via the roots while the atmospheric remainder is inspired by plant leaves.

Maybe if the pseudoscientists stopped taking CO₂ measurements at the summits of active volcanoes, they would have a more accurate carbon cycle.