Environmental, Social and Governance (ESG) issues have become particularly relevant in the agendas of policymakers, investment decisions by companies and asset allocation process of investors. However, the transition to a greener and more sustainable economic system is not without risks. The literature has investigated the relationship between ESG and risk in different ways, through multiple perspectives and approaches. We select all documents with “ESG” and “Risk” in the title, abstracts and keywords available in Scopus and, after removing non‐relevant papers, we are left with a sample of 589 documents published in the period 1983–2022. To provide a view of the most important studies, we also focus on the most cited documents to discuss the methodological approaches and main results. The results show that over time, ESG has gained increasing attention from the literature, but researchers work in isolation and there is no single approach or leading core topic driving academic productivity; a clear taxonomy of ESG risks appears to be missing. To the best of our knowledge, this paper is the first to discuss research on ESG and risk from a financial perspective. The results highlight some existing gaps in the literature that can provide a hint for the development of the topic by researchers. These include a clearer taxonomy of ESG risks that can affect investors' and companies' decisions, a greater effort to evaluate how ESG risks distribute and spill from one sector to another and the inclusion of emerging economies and small and medium‐sized enterprises in the samples.

We explore whether a greater amount of environmental disclosure can reduce a firm's ex ante cost of equity. This could occur because the quantity of environmental information changes investors' risk perception of the company, thereby influencing its ex ante cost of equity. Our study is a cross‐country analysis of 1481 multinational corporations (MNCs) across 43 countries and territories from 2013 to 2019. Firstly, we measure investors' risk perception as a firm's ex ante cost of equity by employing five different valuation models, all based on equity analysts' forecasted data. We then investigate whether large quantities of environmental information disclosed by an MNC affect its ex ante cost of equity. We find evidence that investors price the amount of environmental disclosure. More environmental disclosure decreases a firm's ex ante cost of equity because it lessens investors' information asymmetry. However, this relationship is non‐linear. Once the amount of environmental disclosure data exceeds a certain threshold level, a firm's ex ante cost of equity will rise again. Our empirical results also suggest that non‐financial factors at the country level play a role in shaping how investors perceive a firm's riskiness. Locating the firm in a country with better environmental performance and a higher score of the human development index can reduce investors' risk perception and result in a lower ex ante cost of equity. A policy implication of our findings is that a global standardised and effective corporate sustainability reporting is needed to provide investors a more holistic view for evaluating the riskiness of their investments.

The diffusion of Environmental, Social and Governance (ESG) metrics is increasingly affecting corporates behaviour and their ability to attract investors. Corporate ESG practices are nowadays considered as a key element in evaluating creditworthiness and the cost of capital, to direct funds to the best‐performing companies that limit the harmful impact on the planet and the societies. Due to this increased interest in ESG by companies, investors and policymakers, a high number of ESG scores and metrics have been developed, each with different methodologies and scopes. Because of this variety, it could be therefore challenging for investors to understand and compare ESG measures. In this paper, we address this issue by proposing a method to combine the information provided by different ESG scores into a single aggregate measure of company sustainability and link this combined score to the credit rating of companies. The proposed methodology can help investors to improve their investment decisions by combining more diverse information on company sustainability as a driver of companies' credit rating, thereby reducing information asymmetries.