lrts recap on business models shall we ..., page-9

What the hell are you talking about? How much more simpler can I make it. Yes you can use air but guess what, air is made up of about 79% Nitrogen. Therefore, when you use air in UCG you get Nitrous oxides.

The GWP (Global Warming Potential) for nitrous oxides varies. The site below has the GWP for nitrous oxides as 296 times that of CO2.

http://www.aglobalwarmingawareness2007.com/glossary.php

P.S. Academics do not always make good business leaders.