 It's not straightforward physics. There are many, many things going on. The second is the political message always, that if you don't like the outcome that climate change is occurring, and that outcome is, of course, much stronger regulation on industry, on the way that we live, on the way we heat our homes, our transport and so on, all interfering, you could say, with individual freedoms, and if that's an anathema to you because of your political opinions,