In that period when wind and rain turned into flowers and energy was evaporated by years, there lived a group of familiar and unfamiliar creatures-dinosaurs. I walked into the stream of time and listened to their stories. Dinosaurs are creatures from unknown planets. They came to wake up the earth. After the first dinosaur landed in the wind, its cry made the earth's streams sing crisp songs; Every step it takes, there is grass watching it under its feet, and flowers nodding to it frequently; It lies on the grass, and there will be lush trees to shelter it from the summer sun. It happily returned to the planet, but forgot to close the door to the earth. Dinosaurs used this once-in-a-lifetime opportunity to come to the outside world-the earth. They have lived on the earth for hundreds of millions of years and acted recklessly. Although their leaders are fierce in appearance, they are like Lei Feng at heart. He sent messengers to spread the news and called the dinosaurs home. At this time, the asteroid hit the earth, causing volcanic eruption, thick rocks boiling, dense forests turning into a sea of fire, and the hot airflow caused the climate to be dry and nothing to grow. The dinosaurs lost their homes and disappeared from now on. With the development of social economy and the improvement of scientific level, serious energy shortage and environmental pollution have appeared in energy utilization. Reducing automobile exhaust and industrial waste gas has become a top priority. If human beings continue to act recklessly, various pollutants will enter the earth's atmosphere; If all kinds of pollutants enter the earth's atmosphere, the atmosphere may be destroyed and fragmented; If there is no clean atmosphere, the earth will become dark and cold. Silent world, all creatures will leave this poetic world! Humans will be as miserable as dinosaurs, because the environment is deteriorating and resources are scarce, and they will go extinct. There is nothing delicious; There is no sweet clear water; Without that brilliant sunshine, human beings would not be the masters of the earth, but would just disappear in the long river of history like dinosaurs! Protecting the environment is urgent! Flowers expect the breeze to blow themselves more beautifully; Grass expects green to make its decoration dazzling; The brook expects the fish to play hide-and-seek with it; The earth expects human beings to join hands with themselves to protect this beautiful ecosystem. Clouds pour into summer, another summer! The story of dinosaurs haunts me again.