Hi David, this is cool.
Can you explain why you chose a blockchain distributed database as opposed to an open government-run centralized database. Is it because the government won't and therefore you need a bottom up civil society solution? Or perhaps the government says that it will, but it is not a trustworthy actor.
How would you get everyone in the region to participate, especially those who will pay the tax. Is it dependent on a local political movement or wealthy environmentalists in other countries to get involved. I presume international parties can lock themselves into a payment plan through a blockchain easier than creating an international government/treaty redistribution plan.
Perhaps future work can compare the benefits of the blockchain vs centralized / government solutions.
e.g. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3268282/