Portland cement is one of the largest contributors of CO2 emissions. For each ton of Portland cement made, one ton of CO2 emissions is produced. The Geopolymer binder of Durock™ EcoCap™ is made using a large quantity of industrial byproduct (fly ash) that is instrumental in keeping the CO2 contribution of the product to very low levels. Compared to Portland cement, the net reduction in CO2 emissions resulting from the Durock™ EcoCap™ binder is approximately 80%.