The UN System of National Accounts (SNA) calculates standard national income (NI) under the condition that owned capital is maintained. Roefie Hueting defined in 1969 environmental functions (state, stock) as the possible uses by humans of the environment. Their actual use (flow) nowadays are also called ecosystem services. Hueting defined in 1986 environmentally sustainable national income (eSNI) (flow) under the condition that the vital environmental functions are maintained for future generations. eΔ = NI – eSNI gives the national distance to environmental sustainability. Thus eΔ measures the level of ecosystem services concerning the part that infringes upon environmental sustainability, or the abusive part in the ecosystem services that are provided. This communication aspires at a translation of the terminologies by economist Hueting and ecologists in the research of ecosystem services.

联合国国民核算体系（SNA）在保持拥有资本的条件下计算标准国民收入（NI）。Roefie Hueting在1969年将环境功能（状态，储量）定义为人类可能对环境的使用。如今，它们的实际使用（流量）也称为生态系统服务。休廷在1986年定义了环境可持续的国民收入（eSNI）（流量），条件是为子孙后代维持重要的环境功能。eΔ= NI – eSNI距离全国环境可持续发展的距离。因此，eΔ衡量与破坏环境可持续性有关的部分或所提供的生态系统服务中的滥用部分的生态系统服务水平。