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Global warming is the rise in the average temperature of the earth surface. It is caused by the different green house gases like  CO_{2} coming out of vehicles factories and burning fuels. Green house gases trap the heat of sun's rays in the atmosphere and does not let it escape, hence rising the temp of the earth
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Global warming is formed by the radiation we receive from the sun. This heat is trapped by greenhouse gases in the atmosphere. This keeps the planet warm.
This is what is causing global warming.

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Global Warming is the increase of Earth's average surface temperature due to effect of greenhouse gases, such as carbon dioxide emissions from burning fossil fuels or from deforestation, which trap heat that would otherwise escape from Earth.
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