cost of clean air

例句：

1. 1. The cost of clean air is a significant factor in determining the success of a city's green initiatives.
   清洁空气的成本是决定一个城市绿色计划成功与否的重要因素。
2. 2. The government has been investing heavily in renewable energy sources to reduce the cost of clean air.
   政府一直在大力投资可再生能源，以降低清洁空气的成本。
3. 3.The cost of clean air is often overlooked in discussions about climate change, but it is crucial for public health and well-being.
   在讨论气候变化时，人们往往忽视了清洁空气的成本，但它对于公共卫生和福祉至关重要。