How can we stop climate change? How can we stop air pollution? How can we live on a green planet? One way is to use clean energy. Clean energy does not harm the Earth. It never runs out. Energy from the Sun is clean. We just need to learn how to get and store more of it.
Plants use energy from the Sun. They use it to turn water and air into sugar. The sugar can be used as food. Scientists know a lot about how plants make food. Some scientists want to get energy from the Sun like plants do. They want to make a machine that can use sunlight to make fuel (燃料) from water.
Water is made up of two different parts. Breaking water into its parts is hard. Plants do it all the time, though. It is part of how they make food. With energy from the Sun, the new machine will break water into its parts. One of the parts will be used as fuel. Then the fuel is used to make electricity (电). The electricity can power cars, houses, and so on.
This fuel is better for the Earth than gasoline (汽油). It does not pollute the air. Plants can help us learn how to make clean energy!