Now the earth is in bad condition.For example,in some places,the air and water pollution is so serious that it causes many deaths.At the same time,many animals and plants are in danger because of the destruction of their habitats. now people travel traffic in a number of ways, such as walking, riding a bike, bus, car, etc. different means of transportation on our life has different effects. more and more cars to make the air of the city became more and more worse, we should reduce the drive, to make our city more beautiful. people drive the biggest reason is convenient, greatly reducing the time spent on the way, but also on the air seriously polluted. environment for our life has a great impact, we should try our best to protect their pla, protection of the environment around us. for example, reduce the use of cars to travel by bus or ride a bicycle path is short, can walk, etc.. now, the environment pollution is more and more get the attention of people, we should start from our own, to protect environment of their own contribution to a force。