I would think the biggest application to this new technology would be in power generation. The majority of man-made greenhouse gases come from power generation, not cars. Since most people live near the coasts, and everywhere has access to salt water, the ability to bring power to places that never could have power is now much easier.
As the case is presented, it seems like a pretty safe way to make power as well, if used in a steam application. You would not have to have tons of volatile material (coal, petroleum, natural gas) stored on site, or in transport, nor would you have radioactive by-products. To stop the combustion, you stop the RF source. In a steam application, the biggest hazard would seem to be the pressurized steam itself.