We should make our cities greener by planting more trees, grass and flowers. A green enviromnent can bring us pleasure, beauty and fresh air. Trees, lawns and flowers will make our cities more pleasing to both the eye and the mind, improve the weather conditions and provide fresh air, all of which will no doubt do us a lot of good. Environmental problems are becoming more and more serious all over the world. For example, cars have made the air unhealthy for people to breathe and poisonous gas is given off by factories. Trees on the hills have been cut down and waste water is being poured continuously into rivers.Furthermore, wherever we go today, we can find rubbish carelessly disposed. Pollution is, in fact, threatening our existence.The earth is our home and we have the duty to take care of it for ourselves and for our later generations. Fortunately, more and more people have realized these problems. Measures have been taken to cope with these problems by the government. Laws have been passed to stop pollution. I hope the problem will be solved in the near future and our home will become better and better cars have made the air unhealthy for people to breathe and poisonous gas is given off by factories. Protect Our Environment Our world was colorful,beautiful and full of life. But these years, people have built many factories along rivers. Many trees have been cut down. Many animals have lost their homes. Factories cause pollution. Rivers become polluted. As a student, you should do every things in your everyday life to protect them. First, stop wasting more water. Second, throw waste things into different dustbins. For example, waste paper should be throw into paper recyclable bins. Third, stop cutting down trees. Instead, plant more. Fourth, pick up garbage in the park or on the road when we are free. Last, call on more and more people to pay attention to contrlling pollution. In a word, everybody has his duty to protect the world. 本文来源：https://www.wddqw.com/doc/27eb29e0998fcc22bcd10dd6.html