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=the disadvantage of using plastics is it can harm the environment when it is not being used properly by humans..when humans do not know how to recylce plastics,the chemicals found on plastics can can harm the ozone layer. the same useful qualities can make plastic a huge pollution problem.the cheapness means plastic gets discarded easily and its long life means it survives in the environment for long periods where it can do great harm. because plastic does not decomposeand requires high-energy ultr-violent light to break down,the amount of plastic waste in our oceans is steadily increasing.plastic,the wonder material that we use for everything is perhaps the most harmful of this trash because it does not readily break down in nature. In fact,the plastic that goes over the side today may still be around in hundred of years to foul up the fishing gear,boat propellers and beaches of future generations,not to mention what it will do to the countless generations of marine life and seabirds that eat it or get tangles up in it.careless disposal of plastics can have dire consequenses. the six-pack ring,which relieves us of having to jungle six cans at once,can become a deadly noose for a bird or fish. A plastic bag lookslike a tasty jellyfish to and indiscriminate feeder like the sea turtle,but plastic is indigestible. It can choke,block intestines og,or cause infectionin those animals that consume it. A plastic bag can also clog an outboard engines cooling system. Lost or discarded monofilament fishing line can foul propelleres,destroying oil seals and lower units on engines,or it can becomen an entangling web for fish,seabirds and marine mammals.=

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