Green Bond Principles (GBP) are voluntary guidelines that help issuers raise debt financing specifically for environmentally beneficial projects while giving investors a clearer view of where the money goes. Published by the International Capital Market Association (ICMA) , the GBP are widely treated as the market’s shared “rulebook” for green bond credibility—especially at a time when stakeholders are more alert to greenwashing risk. The Four Core Pillars of the Green Bond