Model of ecosystem risk based on natural capital: a case study System and Method of Accounting Measurement for Forest Natural Capital Ecological footprint depth and size: new indicators for a 3D model Assessing the natural capital use of eleven nations: an application of a revised three-dimensional model of ecological footprint Study On ecological appropriation of Hunan Province in 2000 Valuation of ecosystem services and natural capital Marine ecological capital: concept and attributes Review of Research on Fair Value Measurement for Forest Natural Capital