https://www.wsj.com/articles/it-isnt-easy-being-green-for-a-bond-etf-1544410920
Consider green bonds, issued by governments, banks, municipalities and corporations. The bonds aim to negate the effects of climate change by financing “green” assets in energy, water, heavy industry and the like. Over the past 11 years, some $500 billion in green bonds have been issued, including $138 billion in 2018 through November, the Climate Bonds Initiative says.
On top of that, the money raised from green bonds isn’t linked directly to a specific project or property, so it is up to issuers to update investors on how the money is being used.