随着全球粮食产量的提高，“我们必须保护好水和空气质量。
As the world steps up production, "We have to protect the water and air quality.
在这些社会和环境进程中，世界上用于提供粮食、水和空气质量所必要的可耕地和牧场日渐减少。
These social and environmental processes are stressing the world's arable lands and pastures essential for the provision of food and water and quality air.
美国美孚国际石油集团正在处理全球环境问题如温室气体排放以及地区问题如土地使用、回收、水的使用和空气质量。
American mobiloil group is tackling global environmental issues such as greenhouse gas emissions and regional issues such as land use, reclamation, water use and air quality.
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