However much governments around the world may agree that nuclear proliferation must be halted and that steps should be implemented to reduce the level of nuclear stockpiles, it is difficult for countries to come to agreement on the specific methods of implementing such practices.
1. However much governments around the world may agreethat
Correct. "much" implies the magnitude of the agreement. It does not imply "how many government agree"
2. Despite the agreement among governments
...
1. However much governments around the world may agreethat
Correct. "much" implies the magnitude of the agreement. It does not imply "how many government agree"
2. Despite the agreement among governments
...