This poses a threat to the global economy and the welfare of millions of people. Continuing on a conventional growth route that undervalues natural capital will at some point run up against planetary boundaries which will limit growth prospects. Key pressure points include freshwater limits, ecosystem destruction, atmospheric aerosol pollution, biodiversity loss, climate change and chemical pollution (OECD, 2011). The way in which these problems manifest themselves is often unpredictable, involving a complex web of interlocking problems.