Blue Planet We all have a common home.She provides us with enough food,enough water and enough living room.We get everything from the nature to live better,but we donnot do anything to protect her.How the air is polluted; the earth is poisoned; water is unsafe to drink and rubbish is burying the civilization that man owns.Our environment is being polluted faster than nature and man's present efforts can prevent.Time is bringing us more people,and more people will bring us more industry.So many trees will be cut down,and more large cities will be set up.Lots of waste material,in return,is produced and harms the environment.So some experts declare that the balance of nature is being upset,so that the very survival of man is in danger.How can we solve this problem?The answer is that we must control the speed of growing people,forbid everyone to cut down trees and pour waste water into rivers and so on.If we achieve this,the environment will turn very clean,and our future will be full of happiness.挺簡單的~符合你的要求.