No matter from the global scope or the actual situation in China, human civilization has developed to such a stage that protecting the ecological environment and ensuring the harmony between man and nature is a necessary prerequisite for sustainable economic development and human civilization. Guarantee of continuity. From this we can infer:. ['If the economy is not sustainable, it is not doing a good job in environmental protection.', 'Only by doing a good job in environmental protection can we achieve sustainable economic development.', 'Even if environmental protection is not done well, sustainable economic development can be achieved.', 'Environmental protection can only be done well if sustainable economic development is achieved.']