Which one do you think is the most useful to improve our environment? 1. Walking or bicycling to reduce driving 2. Only consuming organic food (reduce pesticide) 3. Reusing or recycling wastes - There is no shortage of debate pertaining to the best method to enhance our environment. In my opinion, I believe the most useful way to achieve this goal is by replacing driving as much as possible by walking or bicycling. I feel this way for two reasons, which I will elaborate in the following essay. To begin with, reducing driving directly decreases air pollution, a common problem shared by major cities worldwide. According to various researches, emissions by vehicles are the most serious sources of air pollution in our environment. If we limit driving by engaging with walking and cycling, we can diminish car emissions effectively. My own experience witnessing a change in the city I live in is a compelling example of this. Taipei, a lively city in an emerging country, used to suffer seriously from air pollution due to heavy traffic. Roughly ten years ago, the government introduced a low-priced bicycle rental system for citizens. Since then, many citizens started to limit their time driving car while spending more time riding bicycles. The air quality index after this change has improved significantly. Secondly, spending less time driving is helpful to decrease noises in our surroundings. The sound of running engine, tire friction with the surface of the road, and, worst of all, drivers' honking collectively result in serious sound pollution in our daily lives. My experience travelling in Jakarta is a proof of this. During my time there, I lived in a hotel near the main road. Every night, I had trouble falling asleep because the cars on the road were honking voraciously, making the environment unbearably noisy. I believe that I was not the only one who was suffering from this sound pollution in the neighborhood. If there were fewer vehicles on the road, I believe the condition of the noises could have been ameliorated. In summary, I believe that reducing driving by walking or bicycling can significantly make our environment better. This is because not only there will be less air pollution, but also there will be less noise in our surroundings.