Fossil fuels are, of course, the kind of most obvious example of this. We know scientifically that we cannot burn 80 percent of the known reserves of oil and gas and still be able to stay within 1.5 degrees of global warning. But, of course, the valuations of those companies on the stock exchange is based on the idea that you can extract and burn 100 percent of those reserves. So therefore that represents a very significant write-down risk for those companies, and you can see that starting to flow through. Particularly, I think it was BP not all that long ago had a huge write-down of some of their reserves on that basis. And so without being able to assess, to have a methodology for assessing these risks, directors, investors, fund managers, and analysts are in the dark about the scale of the risks that their investments are exposed to. 