In some cases, water is so scarce that farmers break open sewage pipes transporting waste to local rivers.
在某些情况，水稀缺到农民们不得不打开污水管道，将污水输送到当地的河流。
2
A daily input of water, food, and energy of various kinds is matched by an output of sewage, solid waste, air pollutants, energy, and materials that have been transformed in some way.
日常摄入的水、食物和各类能量与输出的污水、固体废物、空气污染物、能源和经过某种转化的物质相匹配。
3
After its use, the wastewater then has to be treated, and some methane from the sewage escapes into the atmosphere.