@sarek,
Malthus, if you will. But can you deny the validity? What other way out is there? I agree Malthus was proved wrong in his time. But was his basic thinking incorrect? Resource usage will still increase along mathematical lines.
The kind of growth we are seeing now is by definition the unwise kind. That is because of the historically unique combination between asymptotically accelerating technology and basic human biological programming. It has nothing to do with any system of government.
Any limited supply of resources will be consumed within a historically short period. Oil is just the primary example.
To keep things pure I am not, and never will be advocating any kind of totalitarian or worldwide government. IMNSHO that is the very worst thing that could ever happen to us. If you want to see oppression such as you have never seen before, by all means go that route. But count me out.
Even today the worldwide system of checks, regulations and balances has evolved far beyond the conventional systems of government.
It is highly conceivable a mixed worldwide regulatory system will eventually evolve. Organizations like the G20, OPEC or OAU or more likely their future equivalents will all play a role in this, both in cooperation and maybe also in competition with each other.
A genuine problem is assuring that democratic control over these institutions is maintained.