water bio s metaphor middle organic storage environmental hold ability recycling droplet untouched rendering d ecological

forest water potable recycling storage droplet organic environmentally environmental bio friendly eco access reusing harvesting distribution energy electricity hydro reservoir scarcity pollution purification purified irrigation dripped spring source supply nature cycle sustaining sustain sustainability ecology tourbanize development sustainable save liquid conservation fresh availability concept environment drinkable green natural metaphor middle hold ability untouched rendering shaped ecological generated use