Because the factories have given a great loss to the environment such as the dirt of the factories have been released into the nearby situated rivers and moreover the smoke is released into the environment which has harmed many birds
today the man have become so selfish that he is not thinking of the things which cannot speak even if they are important part of our life for example the trees the man is cutting down the trees without thinking but the trees cant speak that is the only reason that the trees are been cut and there is no more plantation of the trees