Climate shocks to suppliers threaten companies’ ESG scores beyond direct impacts

A new study has found that climate shocks hitting suppliers can weaken a company’s sustainability performance far beyond the immediate damage at the point of disruption.

Drawing on data from Chinese A-share listed companies between 2011 and 2023, the research maps meteorological information onto the locations of key suppliers to build what it calls a Supplier Climate Physical Risk index. The authors say this allows them to capture the indirect way extreme weather travels thro...

ugh supply networks, rather than looking only at a firm’s own exposure to floods, heatwaves or other climate events.

The results suggest the effect is meaningful. A one-standard-deviation rise in upstream climate risk is associated with a fall of about 4.7% of a standard deviation in the downstream company’s overall ESG score. The paper argues that the damage works through several channels at once: disruption to green collaboration with partners, pressure on social spending as firms divert resources to emergency response, and a tilt towards short-term management thinking.

The findings add to a growing body of work showing that climate risk is not just a site-specific operational problem but a networked threat. Research published in Finance Research Letters has likewise found that rising physical climate risk reduces supply chain resilience among Chinese listed companies. Separate studies in Finance Research Letters and the Environmental Impact Assessment Review show that ESG performance can spill across supplier and customer relationships, reinforcing the idea that sustainability in one part of a chain can shape behaviour elsewhere.

The latest paper also suggests the harm is not evenly distributed. State-owned enterprises, firms with more diversified suppliers and companies led by environmentally aware executives appear better able to absorb the shock. That aligns with industry warnings from S&P Global Ratings, which has urged procurement teams to factor climate exposure into supplier assessment if they want to protect operational resilience and remain competitive.

Taken together, the evidence points to a broader lesson for corporate sustainability strategy: physical climate risk is increasingly a supply-chain issue as much as an environmental one, and firms that fail to account for upstream exposure may be underestimating the threat to their long-term ESG goals.

Source: Noah Wire Services