Reading the article: It's not carbon-neutral — just better than gasoline: > Because the plant currently uses some natural gas, by the time the fuel it produce

Reading the article: It's not carbon-neutral — just better than gasoline: > Because the plant currently uses some natural gas, by the time the fuel it produces has been burned it has released a half-tonne of carbon dioxide for every tonne removed from the air. That gives it a carbon footprint 70 per cent lower than a fossil fuel, he said. So where exactly is the energy coming from? I don't see any mention of renewable sources in that article. Is it somehow combining methane and CO2 to get larger hydrocarbons?