For thousands of years, human beings have constantly recognized, utilized and transformed nature to benefit themselves. Hugo said: Nature is not only a kind mother, but also a cruel butcher. In recent years, due to deforestation and excessive construction of factories, the living environment of human beings has been seriously damaged, and various environmental problems have followed: forest degradation, sandstorms, soil erosion, floods, acid rain and red tides, ozone holes ... There are many chimneys in the air. There are dead fish floating in the river, and the sewage is surging; The ground is full of garbage and piles of waste residue ... 1200 million people live in turbid air,1200 million people are short of water, 12% of mammals and10% of birds are on the verge of extinction, and forests disappear at a rate of 4.5 million hectares per year ... Nowadays, there are barren hills and gullies everywhere, and the mother river of the Chinese nation has become the river with the largest sediment concentration in the world. It is urgent to protect the ecological environment and create a green home. We should establish a sense of responsibility for the times, look at the world, look around us and base ourselves on the campus. We should not just appeal, but start from me, from the side, from now on. We should bend down to pick up the scraps of paper, not from now on. Take a few more steps, don't cross the green belt and trample on it. Students: In order to make the earth beautiful, our home green and the blue sky blue, let's stretch out our hands to defend the green and build a green home together. Sow a green seed today and reap a blue sky and green land tomorrow. Let's start with me.