Since 2016, many governments have issued ‘green’ debt instruments to support the transition to a low-carbon economy. This column shows that a yield discount on green sovereign bonds, or ‘greenium’, exists but is very small, around two basis points in advanced economies and 13 basis points in emerging markets. Still, the greenium rises when climate transition risks are salient and for issuers more vulnerable to climate change. Going forward, governments and international institutions should