Yes and no. Yes, water vapor is more effective at warming than CO2, and is responsible for over half of Earth's total greenhouse effect. But humans have very l

Yes and no. Yes, water vapor is more effective at warming than CO2, and is responsible for over half of Earth's total greenhouse effect. But humans have very little effect on the amount of water vapor in the atmosphere [1]. Emit a ton of CO2 and that CO2 remains in the atmosphere for hundreds of years. Emit a ton of water vapor and it is gone from the atmosphere in weeks. The average emitted water vapor molecule only stays for two weeks. So no, as far as emissions go emitting CO2 is much worse than emitting water vapor. [1] https://climate.mit.edu/ask-mit/why-do-we-blame-climate-change-carbon-dioxide-when-water-vapor-much-more-common-greenhouse https://climate.mit.edu/ask-mit/why-do-we-blame-climate-chan...