Question

What is importance of water vapers in the atmosphere

Answer 1

Water in its various forms is overwhelmingly the most important substance in climate system. Water vapor is a greenhouse gas, even more effective at absorbing the thermal radiation from the Earth's surface than carbon dioxide.

Answer 2

The atmosphere protects living things from the Sun's most harmful rays. Gases reflect or absorb the strongest rays of sunlight (Figure below). The atmosphere shields Earth from the most harmful solar rays.