Harmonious economics refers to the study of the structure and function of a socio-economic system, and the purpose of improving the function of this system, productivity, is to see the coordination and sustainable development between man and nature. According to the above definitions, which of the following is behaviors for developing a harmonious economy? ["A state-level impoverished county has decided to build a mine to mine a rare metal. The reason is that although more than 200 acres of woods must be cut down, a small mountain stream reservoir must be discarded, which affects more than 1,000 people and 2,000 acres of drinking water Land irrigation, but after the mine is completed, it will be of great significance to the development of the county's economy.", 'In order to complete a customer order within a specified time, an enterprise requires workers to work overtime for 5 to 6 hours a day for five consecutive days. Although the workers are tired, they are satisfied with the overtime pay.', "There are more than 100 large and small gold mines in a city. Although most enterprises have aging equipment and their beneficiation technology is backward, the city has decided to continue to develop gold mining, because the city's financial revenue mainly comes from gold.", 'When reviewing foreign investment in a city, it was found that a large chemical company had outdated equipment, high energy consumption, and a backward wastewater treatment system, so it decided to stop introducing the enterprise.']