No wonder a whole expanse of pine tree forest died here.
China is one of the countries in the world that is rich in energy resources.
Its coal production quantity ranks first place in the world. Due to the fact that petroleum is more expensive than coal and nuclear power plants are high in production cost and long in the amount of time taken to break even, therefore the power plants in China mostly use coal to generate electricity. These power plants every year release a large quantity of sulfur dioxide, and cause big pollution to the environment. In China, apart from power plants, another pollution source is the coal burning stove used by many city residents. These pollution sources of various sizes cause great harm to human health.