Hello!
The answer is Evaporation
When you add heat to water, it boils, releasing gas into the air. This is called Evaporation. The water changes from a liquid to a gas.
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Burning fossil fuels release a lot of carbon dioxide which is a greenhouse gas which contributes to global warming. Also burning of fossil fuels causes a lot of air pollution. You can also describe in detail the effect of carbon dioxide on global warming in general