Air and water are 2 of the most precious commodities we have... to some extend, both commodities are cheap and abundant and there is no tangible value to it. Unlike precious metals that are sold by ounce, water and air are close to free........ With urbanisation and deforestation, fresh air will become harder to come by... Huge countries with Canada will have benefit to some extent, hopefully it won't come to a day where we have to pay significant tax to get access to clean air