Does environmental purchasing and supplier management (EPSM) help to reduce greenhouse gas (GHG) emissions in the supply chain and, thereby, mitigate climate change? And, if so, under which conditions? Taking these two questions as a starting point, we hypothesize that heightened environmental protection efforts targeting the upstream value chain should lead to a reduction of greenhouse gas emissions in the buying companies' supply chain. We continue to delineate three contingency factors that might affect the relationship between EPSM and supply chain GHG emissions: The power of the buying firm over supply chain partners, prior experience in EPSM, and materiality of environmental supply chain management in a certain industry. We collect longitudinal data from 260 companies and analyze them using hybrid panel data analysis. We find that the increase of EPSM leads to a significant reduction of the GHG emission intensity of buying firms’ supply chains and that this reduction is stronger for companies operating in industries where emission management is more material.

环境采购和供应商管理（EPSM）是否有助于减少供应链中的温室气体（GHG）排放，从而减轻气候变化？并且，如果是这样，在什么条件下？以这两个问题为出发点，我们假设针对上游价值链的加大环境保护力度应导致减少购买公司供应链中的温室气体排放。我们继续描述可能影响EPSM与供应链温室气体排放之间关系的三个或有因素：采购公司对供应链合作伙伴的影响力，EPSM的先前经验以及特定行业中环境供应链管理的重要性。我们从260家公司收集纵向数据，并使用混合面板数据分析对其进行分析。