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低碳技术创新被视为解决全球气候变暖问题的最关键工具之一,然而其碳强度抑制效应及影响机理却较少获得实证经验支持。本文基于全球专利数据库,利用专利统计方法,测算1992-2012年全球15个经济体的低碳技术创新水平。事实特征分析发现,低碳技术创新水平、能源使用结构和碳强度在演变规律上存在密切联系。本文进一步提出理论假设,利用中介效应模型实证探讨低碳技术创新的碳强度影响机理。实证结果表明:(1)无论是低碳技术创新,还是细分的清洁技术创新和灰色技术创新,都具有直接且显著的碳强度抑制效应;(2)低碳技术创新和能源使用结构皆为碳强度变化的关键影响因素,且低碳技术创新能够以提升清洁能源使用比例为中介渠道,发挥显著的碳强度间接抑制效应。
Low-carbon technological innovation is considered as one of the most crucial tools to solve the global warming problem. However, its carbon intensity suppression effect and its impact mechanism are seldom empirically supported. Based on a global patent database, this paper uses patented statistical methods to measure the level of low-carbon technology innovation in 15 economies around the world from 1992 to 2012. The factual characteristics analysis found that there is a close relationship between the level of innovation in low-carbon technologies, the structure of energy use and the intensity of carbon evolution. This paper further puts forward the hypothesis of theory, and uses the mediation effect model to empirically investigate the carbon intensity influence mechanism of low-carbon technology innovation. The empirical results show that: (1) Both low-carbon technology innovation and subdivided clean technology innovation and gray technology innovation have a direct and significant carbon intensity suppression effect; (2) Low-carbon technology innovation and energy use structure are all Carbon intensity changes in the key factors, and low-carbon technology innovation to enhance the proportion of clean energy use as an intermediary channel, to play a significant indirect carbon intensity inhibitory effect.