I think that's bang on: You recognize the fact that it's not any one year's emissions that are causing the problem. It's the cumulative emissions over time that are causing the problem. We want an approach that targets our cumulative emissions over time, which means sending a long-term signal to the economy that we're on a decarbonization pathway.
At the same time, we want to avoid any really adverse shocks to the economy. We want to build up slowly, but build up to a really strong policy over time.