How long does it take for water vapor to cycle out of the atmosphere?
How long does it take for CO2 to cycle out of the atmosphere?
What difference does it make? CO2 is an insignificant fraction of earthly greenhouse gases and man-caused CO2 is an insignificant fraction of that.
The people spouting this garbage are basically Malthusians: their ultimate goal is to reduce the planet's human population to medieval levels for the glory of Gaea.
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