In recent years, air pollution has been getting worse since more people are conducting projects that are harmful to the environment.

    To begin with, more and more trees are cut down each day. In the past 200 years, humans have destroyed more than half of the trees, which are very important for life on Earth. Trees are crucial to the fight against the greenhouse effect. As we know, Earth is becoming very hot to sustain life. Carbon dioxide is the primary source of greenhouse gases and trees can take in carbon dioxide and transform it into oxygen for animals to breathe.

    Air pollution is becoming serious now — take Beijing as an example. The city was full of smog for months in the last quarter of 2012. Thick smog continues to regularly cover the sky in Beijing. The smog harms people’s eyesight and respiratory tracts. Some people, especially those with poor health conditions, may even die after staying for a certain time in such an environment. The smog sometimes reduces visibility down to 100 meters. It is not a joke. It’s serious. People are making the air dirtier and dirtier. In the meantime, tons and thousands of trees are being cut down. We can’t live in a world with only poisonous air. One solution is to plant more trees now.

    But planting trees is not the only approach.

    First, we can go to school by bus or subway, but not by private cars. Many current automobiles are fueled by oil, which creates a lot of carbon dioxide. Going to school by taking such cars is not clean. As the transportation network of the city has been well-established, we can find many options to replace private cars. Even for those who live far away, it is always possible to find a cheap and clean way to commute.

    Second, save resources of all kinds. When you are washing your face or brushing your teeth, you should turn off the water tap. When you are sleeping, you should turn your lights or radio off. On March 17, many people participated in “ Earth Hour,” which calls on us to turn off our lights to save an hour’s electricity. Many buildings in Shenzhen turned off their lights. It’s a good start.

    In short, we need to face the problem of our environment and react positively.