First, the clean energy industry has the function of changing the way the entire economy develops. Second, the scarcity of traditional fossil energy (oil, coal) is becoming more and more obvious. The development of clean energy will strengthen the ability of developed countries to compete in the international energy market. Third, the clean energy industry is most likely to establish the industrial comparative advantage of developed countries. For example, bioenergy can boost the demand for agricultural products and expand the comparative advantage of developed countries in the agricultural sector. Moreover, developed countries have achieved technological leadership in the development of clean energy. Fourth, compared with fossil energy, clean energy can help reduce greenhouse gas emissions and achieve environmental protection, which is in line with the global sustainable development trend. In terms of environmental protection, the leading edge of developed countries to developing countries is very obvious. Fifth, developed countries can create market demand for clean energy by setting stricter global greenhouse gas emission regulations. "