城市的空气污染造成空气污浊,人们的发病率上升；水污染使水环境质量恶化,饮用水源的质量普遍下降,威胁人的身体健康,过度释放二氧化碳使全球变暖.
Air pollution in cities caused by polluted air,increased incidence of people; pollution to water quality deterioration,general decline in the quality of drinking water,threats to human health,excessive release of carbon dioxide to global warming.