Energy conservation.
D003246:Conservation of Energy Resources; D003247:Conservation of Natural Resources; D003252:Construction Materials; D003363:Cost Control; D004739:England; D006361:Heating; D006749:Hospital Design and Construction; D008284:Maintenance and Engineering, Hospital / Q000191:economics*; D011210:Power Plants / Q000191:economics; D012037:Refuse Disposal; D012606:Scotland; D013548:Sweden