There isn't much of a global governance model currently. The United Nations does a bit, but for the most part it's just anarchy between nations. Thus, it's really hard to get them to cooperate when the incentives push them to defect.
Agreed. The other route which seems popular are the "free trade" agreements, but so long as it's corporations writing them, as far as I can tell such deals are moving in the opposite direction of what would be best for the environment and the vast majority of citizens of the world.
