“Sustainable bonds are a ‘defensive opportunity’ that credit investors should favor over non-green, investment-grade corporate notes, said UBS Global Wealth’s head of credit, Thomas Wacker.”

[COMMENTARY] For similar reasons as to why ESG equity funds are outperforming conventional funds, UBS says favour green bonds over their conventional counterparts.
https://www.bloomberg.com/news/articles/2020-03-30/ubs-says-investors-should-prefer-green-bonds-over-regular-debt, by David Caleb Mutua, March 30, 2020, Bloomberg Green, USA.