I don&#x27;t know but the catalyst Ruthenium is exceedingly rare, only the 74th most abundant element in Earth&#x27;s crust. It usually occurs as a minor component of platinum ores; annual production is about 20 tonnes.<p>You can make urine into fuel with platinum and not create CO2 in the first place.<p><a href="http:&#x2F;&#x2F;www.technocrazed.com&#x2F;scientists-make-urine-powered-fuel-cells-to-drive-cars" rel="nofollow">http:&#x2F;&#x2F;www.technocrazed.com&#x2F;scientists-make-urine-powered-fu...</a>