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The
greenhouse effect is one of the phenomena caused by industrial pollution. From
the data taken by scientists, our earth has been warming up since the Industrial
Revolution. Why does it happen? The factories' emissions have created smog on
the atmosphere. The earth's atmosphere becomes like a greenhouse, and the earth
and everything inside of it have become like the plants in a greenhouse. The sunlight
can pass through the ozone layer but the heat transferred by the sunlight can
not escape easily from the layer of smog and is deflected to the earth's surface
again.