Water vapor (H2O) is the most abundant greenhouse gas on Earth. There is in the air for about 0- 4%, depending on the topography, climate and temperature in tropical areas near the equator and the beach is a lot of water vapor. In the cold polar lower temperature, water vapor in the atmosphere a little. Ice water is essential to life. Water vapor is part of the water cycle in nature. Water can change your status to all three states as a carrier and heat the atmosphere and surface.
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