Water and power supply systems also should be considered. As much as 70 % of the power produced by large electrical power plants is lost in the distribution process. Large water providers-i.e. giant reservoirs-are expensive to build, destroy the surrounding natural and cultural environment, and lose a great deal of water through leakage in the distribution process.
再以水、電的供應系統來說，大型發電廠產生的電力，高達 3 到 5 成是在穿山越嶺的長途輸送過程中耗散掉的，至於水資源的大系統──大型水庫──耗資龐大，破壞生態，在輸送上的溢漏也相當嚴重。