Yes. What we capture is the CO2 that is part of the ethane feedstock. The ethane feedstock is actually what we use to make the ethylene. So we extract the ethane out of the natural gas stream. The ethane actually naturally attracts CO 2, so we do end up with, not a large stream, but about 4% of that stream is CO 2. It is relatively straightforward technology to extract the CO 2 out of the ethane. So basically the way I would put it is that we've done the easiest first.
The flue gas, which is what comes out of our actual plant production, is much more difficult, because that becomes a combination. It's probably, in round numbers, 10% CO 2 and 80% nitrogen. There's water in there, there's oxygen in there, etc. So it's much more difficult, and that's where I'm saying I still think we need some work to figure out how to economically separate that stream.