By MainStreet Partners’ Jaime Diaz-Rio Varez. As the climate clock ticks ever louder, green bonds — long considered the flagship instrument of sustainable finance — may be ready for their next evolution. In 2025, the green, social and sustainability (GSS) bond market surpassed the remarkable milestone of $5.5trn in total issuance, with green bonds making up around 55% of the total. The…