If we're suggesting possible future organisations, I'm with you about a global authority, but I want it to be run and maintained by some sort of artificial intelligence. There are currently no humans that I can think of that cannot fall victim to their own desires and become corrupt when faced with power. Just take that worry completely out of the equation. I would like to think at the point that we have that level of AI, that that technology will have already found solutions to a lot of our current global problems.

Until then your proposal is sound!