Most of the people "don't know how important environment is us to?" 

Let me explain it 

Environment is the habitat which is essential to livings beings. It contains land,water,and air. In lithosphere (land) ,  there are trees that gives us oxygen to breathe and fruits&vegetables and the beauty of the nature. In hydrosphere (water),  we get water which is the most important thing to survive and fish, seaweed and other healthy components to eat. In atmosphere ( air), there is air to breathe. But the deforestation, air pollution and land pollution leads this nature's beauty  to a waste. We need to stop this and become a saviour of environment. Today onwards, we  should  warn the people who are wasting the wonderful wholesome earth's nature.