Climate change etc. should be handled by international agreements.
If there is no competition between countries, governments tend to turn their despotic energies on their own citizens. There would be nowhere for Snowden or Assange to go. If your social credit score is ruined, it is ruined worldwide.
The military would be used to suppress the population. I'm very certain that a world government would turn into a Stalinist hell very quickly.
As much as I want a single government without wars and nations, I believe that you are unfortunately right. A single entity is much easier to be corrupted and suppress humans. Perhaps there is still a way. I think EU is a good example. It has its problems but I can’t imagine Europe without it.
If there is no competition between countries, governments tend to turn their despotic energies on their own citizens. There would be nowhere for Snowden or Assange to go. If your social credit score is ruined, it is ruined worldwide.
The military would be used to suppress the population. I'm very certain that a world government would turn into a Stalinist hell very quickly.