  Green bonds have been shown to be effective tool for sustainability however
market growth is impeded by high issuance and transaction costs. The lack of
appropriate standardisation and frameworks raise fear of greenwashing.
  In this paper, we propose a platform for green bond issuance on the Algorand
blockchain. It offers "Green Bonds as a Service", increasing accessibility
through automation. The solution has minimal associated costs and supports
fractional asset ownership, both of which will help adoption especially in
developing countries. A financial regulator must preapprove an investor and can
freeze assets in the case of financial irregularities. Green bonds can be
bought directly from an issuer or in the secondary market. We also introduce a
novel mechanism whereby an issuer can upload proof of impact reports. A green
verifier uses these to submit a green rating; poor green ratings result in
reputational damage and economic penalties.
