Not only water (vapor) is a greenhouse gas, it's by far the most important. Per wikipedia, its contribution to the greenhouse effect is 36-72%, while the next c

Not only water (vapor) is a greenhouse gas, it's by far the most important. Per wikipedia, its contribution to the greenhouse effect is 36-72%, while the next contribution, of CO2, is 9-26%. https://en.m.wikipedia.org/wiki/Greenhouse_gas https://en.m.wikipedia.org/wiki/Greenhouse_gas