effect of water vapor on the environment
The increased water vapor in turn leads to an increase in the greenhouse effect and thus a further increase in temperature; the increase in temperature leads to still further increase in atmospheric water vapor; and the feedback cycle continues until equilibrium is reached.
Best Answer: Water vapor is the dominant greenhouse gas in the atmosphere. Water vapor high in the atmosphere can produce 'noctiluminescent' clouds, primarily from the space shuttle exhaust. At ground level it makes things humid and unpleasant, though it does prevent plant dessication. Dew and fog can be an important source of moisture in some environments. A broad question.