Sustainable debt market reaches US$7tn

The Global Sustainable debt market has surpassed US$7 trillion in cumulative issuance.

New data release by the Climate Bonds Initiative shows the green, social, sustainability and sustainability-linked bond market, collectively referred to as GSS+ has added almost US$6 trillion in issuance since 2020 alone. The market took 13 years, from 2006 to 2019, to reach its first US$1 trillion milestone.

Since 2021, annual growth has averaged around US$1 trillion a year, underscoring accelerating investor demand for climate and sustainability linked financing structures.

The Climate Bonds Initiative said the milestone demonstrated sustainable debt markets are now operating at institutional scale across regions, currencies and issuer types, even amid heightened geopolitical uncertainty and more volatile macroeconomic conditions.

Green bonds continue to dominate the market, with cumulative issuance now exceeding US$4 trillion. According to Climate Bonds Global State of Market 2025 report, green labelled bonds accounted for 64% of aligned GSS+ issuance last year, supported by strong demand for projects tied to clean energy, low carbon transport, green buildings and climate resilience infrastructure.

Europe remained the largest regional market in 2025, representing 45% of total aligned annual issuance, while more than 400 new issuers entered the sustainable debt market during the year.

The organisation said the rapid growth reflects increasing adoption of labelled debt instruments by governments, banks, corporate and development institutions seeking to fund the transition to lower carbon and more resilient economies.

Social and sustainability bonds have also continued to expand as investors broaden their focus beyond climate mitigation toward affordable housing, healthcare, education and inclusive growth initiatives.

Despite the sector's growth, Climate Bonds warned significantly more capital would still be required to finance the global transition, estimating around US$10 trillion annually will need to be mobilised to support climate resilient and low carbon economies.

The organisation said the next phase of growth would depend heavily on maintaining market integrity through stronger standards, clearer taxonomies and credible transition pathways.

"Sustainable debt is now operating at scale across regions, issuers, currencies, and use cases," Climate Bonds said.

"The next phase is about getting the right deals in place," they said.