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The purpose of this study is to extend existing knowledge on the determinants of sustainability report (SR) assurance practices. Four different theories – stakeholder theory, institutional theory, signaling theory and legitimacy theory – are used to formulate several hypotheses regarding the main factors that can influence a company’s decision to assure its SRs.

Using a sample of 417 listed organizations based in different European countries over five years, the effects of stakeholder commitment, country orientation toward sustainability, firm environmental performance and business ethics controversies on the decision to assure SRs are assessed.

The results show that a company’s decision to assure its SRs is motivated by the need to maintain good relations with its stakeholders (which is in line with stakeholder theory and legitimacy theory), as well as by the willingness to signal their sustainability performance (which is in line with signaling theory) and to gain legitimacy. On the contrary, business ethics controversies do not seem to be relevant to a company’s assurance practices.

This paper provides new insights into the influence that social, environmental and institutional factors have on assurance strategies. New factors that previous research does not investigate – environmental performance, business ethics controversies and corporate governance – are tested. Factors that are already investigated in the literature are considered from an original perspective of introducing alternative measures (e.g. for the scope of national sustainability policies).

We conduct a multidisciplinary systematic literature review on climate neutrality in the supply chain. While carbon neutrality has gained prominence, our study argues that achieving carbon neutrality alone is not enough to address climate change effectively, as non-CO₂ greenhouse gases (GHG) are potent contributors to global warming.

We used multiple databases, including EBSCO, ProQuest, Science Direct, Emerald and Google Scholar, to identify articles related to climate neutrality in the context of non-CO₂ gases. A total of 71 articles in environmental science, climate change, energy systems, agriculture and logistics are reviewed to provide insights into the climate neutrality of supply chains.

We find that, in addition to CO₂, other GHG such as methane, nitrous oxide, ozone and fluorinated gases also significantly contribute to climate change. Our literature review identified several key pillars for achieving net-zero GHG emissions, including end-use efficiency and electrification, clean electricity supply, clean fuel supply, “GHG capture, storage and utilization,” enhanced land sinks, reduced non-CO₂ emissions and improved feed and manure management.

We contribute to the literature on climate neutrality of supply chains by emphasizing the significance of non-CO₂ GHG along with CO₂ and highlighting the need for a comprehensive approach to climate neutrality in addressing climate change. This study advances the understanding of climate neutrality of supply chains and contributes to the discourse on effective climate change mitigation strategies. It provides clear future research directions.