Even 2020 actually is flexible. The reason for that is that we know where we need to get to by 2050 at the minimum. Maybe we need more, but we at least need that, according to the scientists.
However, this bill does not provide for any prescriptions whatsoever in terms of how we achieve this goal. There are many tools that we're going want to consider, many of which we're going to want to use. It's going to be up to the governments now and in the future to determine exactly how we do it. As Jeffrey Simpson made very clear in his recent book about climate change, a succession of governments from several parties have made commitments that we have not come anywhere close to meeting, and we actually have increases instead of decreases.
Are we going to need flexibility? I'll let you answer that question for yourself. Like you, I hope we have firm targets, targets that are as firm as possible. If we can do it even faster, we lower the element of risk, but things change, politics change, technology changes, and I'm sure this will evolve over time. That's why I have resisted lots of suggestions on trying to be prescriptive about different methods for actually achieving this target.