half a million cubic metres of wastewater each day
... that Abu Dhabi generates more than half a million cubic metres of wastewater each day, and almost all is treated and re-used to irrigate green space in the city?
... that <a href="./Abu_Dhabi" id="mwGPg" rel="mw:WikiLink" title="Abu Dhabi">Abu Dhabi</a> generates more than <b id="mwGPk"><a href="./Water_supply_and_sanitation_in_Abu_Dhabi" id="mwGPo" rel="mw:WikiLink" title="Water supply and sanitation in Abu Dhabi">half a million cubic metres of wastewater each day</a></b>, and almost all is <a href="./Water_treatment" id="mwGPs" rel="mw:WikiLink" title="Water treatment">treated</a> and re-used to irrigate green space in the city?