Question

Why accumulation of plastic is considered a serious problem ?

Answer 1

It takes a long time for the plastic to decompose in the environment. Plastic is also harmful to animals. Birds get it stuck in their throats and fish in the ocean can get it wrapped around their body and can't swim.
In addition to the waste created by plastic, the production of plastic is harmful to the environment. Plastic is made from petroleum and the refining process of petroleum puts a lot of toxins into the earth's atmosphere.