Much of our waste , especially waste from factories , electric - powered stations , the chemical industry and heavy industry , is very dangerous . Fish die in the lakes , rivers and seas , forest trees die , too . Much of this dangerous waste goes into the air and is carried by the wind for great distances The Earth is our home . We should take care of it , for ourselves , and for our children and grandchildren . This means we have to keep our environment green and clean . The importance of this task is pointed out by ecologists - the scientists who study the relations between living things and the environment . However , each of us must do everything possible to keep the land , air and water clean .

Much of our waste , especially waste from...... factories , electric - powered stations , the chemical industry and heavy industry , is very dangerous . Fish die ..in.. the lakes , rivers and seas , forest trees die , too . Much of this dangerous ......waste......goes into the air and is carried by the .wind.... for great distances The Earth is our home . We .should... take care of it , for ourselves , and for our children and grandchildren . This .mean... we have to keep our environment .green....... and clean . The importance of this task is pointed out by ecologists - the scientists .who...... study the relations between living things and the environment . ..However............ , each of us must do everything ...possible.... to keep the land , air and water clean .