No, no. The first and most important thing is full coverage. There's been a lot of discussion of covering our large final emitters, but there's been very little discussion of actually covering our entire economy, which includes our urban consumption in our urban systems.
So you first need full coverage. That's missing here in a lot of the discussion that's occurred.
Now, as to how you get there, you can get there through an upstream cap and trade system, high up in the system. You can have downstream cap and trade mixed with things. You can put a direct charge on carbons. There are many ways. But the first thing is that full charge, full coverage in the system. That will do most of your filtration for you.