Financial mechanisms for advancing environmental sustainability: a comprehensive review

The accelerating urgency of environmental degradation, climate change, and resource depletion has positioned finance as a pivotal tool in achieving global sustainability objectives. This review offers a comprehensive synthesis of financial mechanisms that support environmental sustainability, examining both traditional instruments—such as green bonds, subsidies, and public-private partnerships—and emerging innovations like impact investing, ESG integration, green loans, and crowdfunding. More specifically, the paper critically evaluates how these mechanisms mobilize capital, manage environmental risks, and incentivize low-carbon transitions across diverse sectors and regions. It also explores the institutional frameworks, policy incentives, and regulatory environments that shape the design and effectiveness of green financial instruments. By analyzing trends in renewable investment, the role of ESG in investment decision-making, and the integration of environmental risks into financial governance, the study identifies key enabling conditions for scaling sustainable finance. Special attention is given to current challenges, including fragmented policy taxonomies, inconsistent measurement and reporting standards, and gaps in climate-related risk management. The review concludes by emphasizing the need for policy harmonization, standardized disclosures, and inclusive financial innovation to align capital flows with the goals of the Paris Agreement and the Sustainable Development Goals (SDGs). This study contributes to the evolving discourse by offering a consolidated knowledge base, highlighting critical gaps, and proposing future research directions that bridge finance and environmental science for systemic transformation.