The sectoral blind spot of green bonds in the European green transition

As sustainable finance becomes the central engine of the European green transition, how green-bond proceeds map onto distinct environmental objectives remains poorly understood. This study provides cross-sectional econometric evidence on the macro-financial and environmental correlates of green-bond issuance across the EU-27. Defining market penetration as the green-bond share of total national corporate and sovereign issuance, we use four-year averages (2021–2024) to combine bivariate correlation with ordinary least squares regression. We find that issuance is associated with the share of renewable energy and environmental health but shows no detectable association with circular material use, ecosystem vitality, environmental taxation, or climate-change performance (R² = 0.44; renewable energy, p = 0.002; GDP per capita, p = 0.019; climate performance, p = 0.50). A concentration analysis further shows that participation broadened until 2021 and narrowed again in 2024 (Gini 0.85 in 2014, 0.48 in 2021, 0.79 in 2024) rather than rising steadily. These findings point to a critical policy challenge, as capital appears to follow institutional capacity and structural measurability rather than holistic climate ambition, creating a sectoral blind spot. To broaden the environmental reach of green bonds, we identify the standardisation of metrics for underfunded sectors – through the EU Taxonomy and the European Green Bond Standard – as the most direct policy lever.