开头：
With the improvement of our living standards, more and more people can afford to buy cars. As a result, the roads are often filled with cars, and the problem of air pollution becomes increasingly serious. At this point, we advocate a low-carbon lifestyle. My suggestion is that we should ride bicycles more often instead of driving. Not only can we exercise our bodies, but we can also protect our environment. Why not give it a try, my dear friends？
结尾：
Now, our side of the car is constantly increasing, and the environment is also getting worse and worse! The air around us is filled with pollutants. Let's start from the small things, start from now, pick up every piece of paper on the ground, take good care of trees and flowers, and love small animals. Let's go and look for the green world together, to make our world a better place!
希望这个开头和结尾能对你的写作有所帮助。