Well, he burns that, he doesn't emit it, so I don't see why that matters. Once burned it seems like the same old CO₂ is emitted, so what he does is a net win...

Well, he burns that, he doesn't emit it, so I don't see why that matters. Once burned it seems like the same old CO₂ is emitted, so what he does is a net win... or? I'm not a chemist.