Energy prices, emission credits, and tax abatements are all factors that encourage friendly environmental technologies. At present low energy prices and modest emission credits and tax abatements provide weak incentives. However, as time passes energy price may increase due to scarcity. Similarly, air quality will become a priority if society continues to pollute the environment. In such a case, carbon and nitrate credits would become much more robust. Any of these scenarios would result in improved the NPV and payback.