A World Government Proposal

What is the biggest problem of our world or the whole human civilization?

Is it lacking full healthcare or good education for everyone?
Or not enough food and/or water for everyone?
Not (good) enough jobs/money for everyone?
Not (good) tech and/or living standards for everyone?
How about the lack of permanent world peace or the lack of (a fair and effective) world government, that quickly solves all problems between any countries of our world?

If we look at the history of our world, we see many big and small nations, city states, kingdoms, empires, countries make wars from time to time.
The problem is how much damage happens to so many people and their property in each war!
Also consider, thanks to keep advancing military weapons (because of the constant power competition between all countries of the world), possible damage from any big/small war is keep increasing all the time, fast!

Besides of wars, big/small countries of our world, also keep running into disagreements that bring bad consequences for one side or both.

Also, who can say the outcome of any particular war/disagreement was really fair for everyone?

Okay but how do we know creating a fair and effective world government is even possible?
Currently we have UN (as a second attempt I believe) but it obviously cannot solve all international problems. Can we really create a new UN (more like a true world government) that is fair and effective for any and all international problems?

In the current UN voting/decision system, each member country has a right for a single vote for each decision. But any (permanent or temporary) member country of the security council has a right for preventing any UN decision. Can we really create a more fair and effective voting/decision system?

What if there was no security council to prevent any decision? Then, obviously, biggest and/or most powerful countries would not accept to have equal voting rights with smallest and/or least powerful countries, and rightfully so IMHO. If so then, what if we find a way to fairly (each year re-)calculate how many votes each country needs to have?

Obviously, first, we would need to find a fair and equal way to evaluate each and all member countries. Imagine in the end of evaluations, each country gets an overall score, to be used as the weight, to calculate the number of its votes.

And to calculate overall scores, what if we put together a big international group of scientists/experts, and asked them to determine a standard set of statistics (and their weights) to evaluate economic/military/industrial/technological/scientific power, land size, population, living standards, healthcare, education of each and all member countries, to calculate a (sub)score for each, and later, apply a standard set of weights to all sub-scores, and add them together, to calculate overall scores for each member country?