Natural Capital - Nub of the Argument

In 2011, it was estimated that the Natural Capital of the UK was about £1.5 trillion - about the same size as our national debt.
The following excerpt, from "Capitalism within planetary boundaries (2015)", sums up the nub of the argument for analysing Natural Capital, and I would argue that this needs to be done within a World Balance Sheet:

"The numbers being published as to the financial value of nature can certainly be contested. But the point is that nature is not worth nothing in economic terms. And simply put, this is why: despite hundreds of speeches, laws and good intentions, economic decisions still lead to the overall degradation of nature. Nature is regarded in mainstream economics as merely a set of resources to be converted into economic growth, failing to appreciate how value is often being lost, as vital ecosystem services are progressively degraded, with the costs arising from that appearing on nobody’s balance sheet."