Th average temperature of the earth has been increased as a result of
higher level of carbon dioxide and other greenhouse gases in the
atmosphere.
The carbon dioxide and other greenhouse gases has increased over the
past century as a result of the emission of these gases by automobiles,
industries etc.
These gases deplete the ozone layer which is responsible for the
absorption of sun rays .When this happens, the sun rays reaching the earth
will be increased thereby causing an increase in temperature.
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