Question

How vapor contribute to climate change?

Answer 1

Due to vapour, clouds are formed and a lot of rain is poured so the vapour also contributes in climate change.

Answer 2

Answer:

As a greenhouse gas, the higher concentration of water vapor is then able to absorb more thermal IR energy radiated from the Earth, thus further warming the atmosphere. The warmer atmosphere can then hold more water vapor and so on and so on. This is referred to as a 'positive feedback loop'.