Estimating sustainability gaps: methods and preliminary applications for the UK and the Netherlands

Received 7 February 2000; received in revised form 13 November 2000; accepted 15 November 2000 This paper sets out and applies a new methodology for determining whether or not economic activity is environmentally sustainable. By comparing current environmental impacts with standards of environmental sustainability, it calculates the ‘sustainability gaps’ (SGAPs) with respect to different environmental impacts. For the UK, SGAPs are computed for C0 SO and other air pollutants. Across none of these environmental themes can current UK use of the environment be said to be sustainable. The SGAP indicators can be combined with current trends to show how long it would take, on continuation of the trends, for the sustainability standard to be attained. The paper calls this indicator the ‘Years to Sustainability’ (YS) measure. For the policy objective of sustainable development to be made fully operational, it is necessary for the concept of environmental sustainability to be clearly defined by quantitative indicators. On the basis of the indicators set out in this paper it can be judged whether economic activity is moving towards or away from environmental sustainability, and at what speed.