Dynamic Environmental Targets and Technological Progress
分析社会最优环境目标（污染物流量目标）如何随不同类型技术进步动态调整，基于一个包含生产、污染产生与处理的宏观模型，发现不同技术进步需要不同的目标响应，且每种技术进步都要求目标方向随时间反转。
summary: this paper analyzes socially optimal responses of environmental targets (i.e. targets on pollutant flows) to different types of technological progress. with reference to a simple macro-economic model including production, pollution generation, and pollution treatment, a socially optimal temporal sequence of environmental targets is derived. in this context, it is shown that different technological improvements (e.g. increases in labor productivity or improvements in the pollution technology of the production activity) require different dynamic target responses. moreover, every technological improvement representable by the model calls for a intertemporal target reversal, i.e. a change in the environmental target's direction of movement through time .;