Sustainable development is the common goal of global development. As a clean and renewable energy source, wind energy will certainly become one of the important energy sources in the 21st century. The theme image in the poster design represents wind energy. In the poster, red and blue represent the sun and the Earth, because we know that the wind is the energy that is converted from solar energy. As long as there is the sun and the earth, there will be wind. The green in the picture represents cleanliness and health. A small step can accomplish great power and require people to work together!