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4000 BCE
horses
the horses used to work in the countryside transporting the people, the pooop of the horses pollutes the air -
steam machine
in1765 the people used to travel in the steam machine this vapors contaminatewd the ambient -
steamboat
the steamboat used to fight and Commerce between countries.
the fuel used affect the air -
bike
The bike used to be used to transportation and today it is still used for sports -
plane
the plane used to transporting troops and arms contamineited the air