When recycling economy and ecological economy consider natural resources again, they not only consider them as available resources, but also ecosystems that need to maintain a virtuous circle; when considering science and technology, they not only consider their ability to develop naturally but also fully consider the stability Its ability to maintain and repair ecosystems, making it a technology that is good for the environment. When considering human development, we not only consider human's ability to transform nature but also pay more attention to the ability of people to live in harmony with nature and promote the all-round development of people. What does this text express the idea of a circular economy and ecological economy? ['Systematic.', 'Values.', 'Production concept.', 'Environmental protection.']