The population of the earth is increasing very fast. Humans must make the earth support the increasing population. This has made it necessary for agriculture and industry to develop rapidly. Such a rapid development produces more and more waste, which goes into the water, the soil and the air. Some of it is made harmless. However, where there is too much of it, the poisonous waste may do great harm to the things around the people. When farmers add fertilizer to the soil to make plants grow better, or use poison to kill pests, p氦孩份绞莓悸逢溪抚娄oison is sent into the air, the water and the soil. When birds, fish and people eat the grain, drink the water or breath the air, harm will be done to their health. The air in big cities is often made very dirty by cars and factories. Millions of tons of waste and poisonous gases are sent into the air with the *** oke. In some places, little is done to make the *** oke clean before it goes into the air. Fortunately, people are beginning to realize just how serious the whole situation is. In many countries, laws have been made to stop factories from sending out poisonous gases. our earth is sweating and steaming because of the large population and warm weather, some people think it doesn’t matter when the earth gets a little warmer. but we are wrong, if the earth gets hotter, it will cause the level of the sea to rise. and as a result of it, lots of cities of the coast such as shanghai, hainan would be under water. besides, the global weather system will change too, causing too much rain in some areas and too little in others. through we know the condition of our earth is being worse, few people will do something to protect the environment. too many of us just sit back and take it for granted that it's the governments’ responsibility. meanwhile, we must change our thoughts, everyone can make a change .we can plant a tree, abandon using plastic bags and do some recycling. the workers and students also can choose the bus to go to work or school instead of cars. in a word, the earth need the care from human beings, we should make the environment protection stronger and improve the condition of our earth.