The operation of the ecological economy is defined as an economy that does not damage the environment, does not pollute the environment, and that is not an economy based on non-renewable resources. According to the above definition, which of the following is eco-economics? ['After the road was built in a certain place with the funds raised by cutting trees, it will greatly facilitate the travel of villagers.', 'When a city develops the coal economy, it focuses on improving technology and increasing resource utilization to protect and repair the environment.', 'A village uses the biogas project of livestock, biogas and cash crops to develop the local economy.', "A township uses new types of fertilizers and pesticides to develop a fish-bream polyculture model, and farmers' harvests reach new heights."]