Green finance has surged in popularity, spanning green bonds, ESG funds, clean-energy benchmarks, and—more recently—energy-efficient cryptocurrencies. Yet bundling these assets under a “sustainable” label can hide a crucial question: how do they behave together when markets are under stress? A new study tackles the missing piece by examining risk transmission across sustainable asset classes during extreme conditions.
Researchers led by Professor Sang Hoon Kang of Pusan National University analyzed connectedness among seven green cryptocurrencies and three major green financial benchmarks. The dataset covers daily markets from November 2017 through July 2024, capturing both the COVID-19 shock and later geopolitical disruptions. Their goal was to quantify whether sustainable assets diversify each other or amplify contagion.
To move beyond average relationships, the study uses a quantile vector autoregression framework. This method estimates interactions differently across market regimes—bearish, normal, and bullish—so tail behavior is not blurred by mean-based models. In practical terms, the approach reveals how volatility spillovers shift when sentiment collapses or surges.
The results show a pronounced U-shaped connectedness pattern. During relatively stable periods, interactions between green cryptocurrencies and traditional green assets remain moderate, leaving room for diversification. In contrast, connectedness rises sharply during market downturns and booms, making the system more synchronized.
As regimes become extreme, the diversification benefit erodes. The study suggests that “green” assets can become highly coupled under stress, increasing the likelihood of financial contagion across the sustainable ecosystem.
Portfolio-based analysis indicates limited hedging power for traditional green assets against cryptocurrency volatility. Among the cryptocurrencies examined, Cardano and Stellar stand out as the most influential transmitters of volatility to the broader sustainable market structure.
Meanwhile, green bonds, clean energy indices, and ESG investments behave more consistently as net receivers of volatility. Rather than buffering shocks, these instruments may absorb disturbances originating from cryptocurrency markets.
The paper also reports that major global events intensify these links, with COVID-19 elevating interconnectedness and keeping it heightened afterward. As crises intensify, spillovers strengthen and the system becomes less resilient to shocks.
Overall, the findings challenge the assumption that sustainable assets are automatically safe havens. The authors argue that investors and regulators should treat green cryptocurrency integration as a systemic-risk factor, especially when markets enter unstable regimes.
Subject of Research: Risk management and financial connectedness across sustainable asset classes
Article Title: Are green bonds and green energy markets hedges for green cryptocurrencies? A quantile VAR approach
News Publication Date: 09-Jun-2026
Web References: https://doi.org/10.1186/s40854-025-00868-8
References: 10.1186/s40854-025-00868-8
Image Credits: Credit: Professor Sang Hoon Kang from Pusan National University, Korea
Keywords: green finance, ESG, green cryptocurrencies, volatility spillovers, quantile VAR, connectedness, diversification, hedging, systemic risk, tail risk
