What exactly is Thermal Depolymerization?

Here is a link to a description of the Thermal Depolymerization process. It is called CWT Thermal Process (CWT-TP), named after Changing World Technologies, Inc (CWT), http://www.itcnet.org/Fire%20web%20site/B_Articles%20&%20Reports/Changing%20World%20Technologies%20-%20Thermal%20Process.pdf. Curiously, there is no mention in the paper of offensive, excess emissions from the process. It kind of makes you wonder if they forgot to tell us something, or their design is flawed. Either way, it stinks.