It's not hard to figure out what they're talking about. Either water is turned to hydrogen and oxygen, or CO2 to CO and oxygen, via electrochemical techniques. The resulting gas can be combined with more CO2 and/or water and thermally shifted to make syngas (CO + H2), which is converted to methanol over a copper catalyst. Methanol can be dehydrated to DME, which can be used in diesel engines or used as a propane substitute.

It's all much cheaper to get the syngas from coal or natural gas, though.