• Regen Network
• Earth Token
• Veridium
• UN Climate Chain Coalition
• electriCChain / solarcoin / etc
• https://carboncoin.cc/ and http://www.ecohustler.co.uk/2018/01/31/bought-50m-carboncoins/
• Biocoin Creating an Infrastructure for a Biodiversity Information Token Economy
• Nori CO2 token

• Ocean mining
• Bitcoin Blockchain Australian Power Company to Reopen Coal Power Plant to Mine Bitcoin

see also: environmental_machine_learning