In recent years, the natural calamity situation has become more and more serious. Dangerous storms, volcanic eruptions, Arctic ice are slowly melting. These all come from global warming. What is the cause of global warming? First, greenhouses are one of the major causes of global warming. Because greenhouses have very high heat absorption. The second reason is the amount of CO2 released into the air. As the amount of CO2 increases, the amount of heat transmitted to the earth by the sun will be absorbed and retained by the sun. Normally, the emitted C02 gas will be absorbed by the plants and returned to the O2 gas. But the indiscriminate deforestation makes the amount of trees not enough. These are the main causes of global warming. When the earth warms, it means climate change. Hence the phenomena such as melting ice mentioned in the first section have appeared. We are developing right now, but this development is not sustainable. If we remain indifferent, we will kill ourselves. Although we cannot change what happened, we can improve the environment together.