SNH NCAIPaul Watkinson  – an economist with Scottish Natural Heritage highlights the use of Scotland’s Natural Capital Asset Index. There are presentations on making more use of Natural Capital Asset Indexes at the forthcoming Valuing our Life Support Systems Summit.



The term ‘natural capital’ is a metaphor describing nature: a stock of capital which yields a flow of ecosystem services (everything from crops and water, to flood protection and pollination, to opportunities for recreation). This resort to an economic metaphor can cause problems, but as Daija Angeli explains, the concept of natural capital resonates with decision makers.

Scotland’s Natural Capital Asset Index (NCAI) is an example of a tool which utilises the terminology. Designed to track changes in the condition of Scotland’s nature (see graph below), the NCAI shows how natural capital can be considered alongside other forms of capital (human, manufactured, social). The NCAI provides evidence that Scotland’s overall stock of natural capital declined between 1950 and the 1980s, but has stabilised over the past 25 years. To what extent was the decline caused by economic growth? Why has it stabilised in recent years? How can we improve nature in Scotland? Answers aren’t certain, but we hope that the NCAI reinforces our appreciation that every economic system is connected to – indeed is wholly reliant upon – a prosperous environmental system.

NCAI graph

Another question that a new group is striving to answer regarding the NCAI is whether we’re measuring the right thing: how confident are we that the indicators used to compose the NCAI reflect the condition of natural capital assets? Our understanding of quite what we need to measure has advanced in recent years, not least because of the work of the UKNEA and the Natural Capital Committee. We are currently refining the NCAI’s methodology, and will release an update in 2015.

I often reassure people that when I talk about nature’s value I don’t necessarily mean its monetary value – the NCAI does not attempt any explicit monetary valuation, for instance. I feel that opponents of the concept of natural capital often unfairly equate it with monetisation. To be clear, there are many aspects of nature for which attempts at monetary valuation will remain impossible and/or foolish. The concept of natural capital is helping us recognise, protect and enhance nature’s value, and it is not doing this just by putting a monetary value on elements of nature. To the contrary, I think the natural capital metaphor enhances our understanding of the multiple dimensions of nature’s value.