Water is the source of life.

     In our life, water is the most important life source. But, with expansion of population and cities, a large number of forests have been cut and global climate is becoming warmer than it was hundreds of years ago. This consequence mainly comes from the role of water on ecosystem. Firstly, water is recycled in the earth. Water is chiefly evaporated from the ocean, condensed in the atmosphere. Then, it forms the rain cloud, becomes precipitation and returns to the ground. This process goes round and round. The pollutants from Human consumption and production enter into water cycle in many ways, which results in increasingly worse water mass and affects people’s health. With the number of people increasing, water that can be drunk in the nature is not far from solving human needs. Therefore, the source of water is increasingly precious. Secondly, water is the base of ecosystem. Whatever animals and plants, they all need water. Plants make use of water to carry on photosynthesis and respiration. My tree that is like them carries on these two actions to grow up every day. What’s more, animal respiration needs water. Thus, water is the foundation of everything to protect the nature.