Thus the climate policy models in recent years started to model technological change using endogenous approaches.

近年来的气候政策模型则开始逐渐利用内生方法模拟技术变化。

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Technological change in the early climate policy models is often seen as non-economic, exogenous variable, so the in-depth analysis of the cause and effect of technological change is very difficult.

但是早期的气候政策模型通常将技术变化视为非经济的外生变量，因而无法对技术变化的起因和效果做深入分析。

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Technological change in the early climate policy models is often seen as non-economic, exogenous variable, so the in-depth analysis of the cause and effect of technological change is very difficult.

但是早期的气候政策模型通常将技术变化视为非经济的外生变量，因而无法对技术变化的起因和效果做深入分析。

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