Science
HSBC, Queensland government buy first ever ‘reef credits’ – The Australian Financial Review
They are based on carbon credits but instead of paying farmers to plant trees or otherwise increase carbon sinks, they motivate growers to improve their practices….

“But the second biggest threat is water quality. Unlike climate change, water quality is something we can change in a relatively short time, and if we can do that, we can give the reef a fighting chance to beat climate change. He put the cost of dealing with water pollution on the reef at between $4 billion and $8 billion.
Like carbon credits, but unlike green bonds, investors in reef credits are not paid a coupon and receive no return. Their value may simply be in the environmental good they do….
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