The sun radiates heat to planet earth in the form of lightwaves, which are later radiated back into space as infrared. Now, Earth's thin layer of atmosphere keeps some of the lightwaves, trapped in the air to maintain a certain balance of temperature. The trapped lightwaves give the earth the needed warmth to make the planet habitable for its living creatures.
However, with too much greenhouse gases that pollute the air, the atmosphere had thickened making it difficult from the excess lightwaves to be radiated back into space. Hence, more lightwaves are trapped in the atmosphere. Over the years, the lightwaves that are trapped have increased way over than what is necessary and healthy for the planet.
The trapped infrared now heats up the earth, melting giant glaciers all over the world and evaporating seas and oceans so much faster than normal that it creates drastic climate change. And that is the danger of Global Warming.
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