Once Green house gases were not harmful..!

Green house gases includes carbon  dioxide,methane,nitrous oxide.earlier grren house gases use to form layer around the earth surface,trapping some of the rays of sun and some were reflected back to the atmosphere,thus maintaining the earth's temperature.but know humans have suck the earth,our mother earth is dying day by day.due to human activities like deforestation,burning of fossil fuels,vehicles have increased the amount of green house gases in the earth atmosphere,making the layer around the earth thick,so all the rays of sun get trapped inside this layer,thereby increasing the earth's temperature.this is called global warming.

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