Do I really need to define the word "extraterrestrial?
yeah, I know, I was just playing.
You'll have to be somewhat more specific on why a world government would be any different than any other government in any way
OK...first forget about the current situation on the planet, temporarily.
Lets start with a clean slate. Earth, humans, current technological know-how.
Humans need material things (products) to survive. Earth is the only source of materials to mass-produce those products. The planet is able to sustain life indefinitely if materials from the planet are converted from their natural state into an other state, in balance.
A true world government would consist of a nucleus/head office, where all industries (industry) meet to confer about improvements to industry, including and not limited to technological advancements, distribution, and creation of other mass-produced products, that are NEEDED.
A true world government ensures that ALL individuals are able to purchase either a 'high-tech' version or a 'low-tech' version of any particular type of product. Rest assured, all individuals have that which is needed in some particular form. And food (a wide variety of fresh fruits and vegetables, nuts, grains, seeds) and fresh water (preferably distilled) are plentiful, as always, but always DISTRIBUTED where NEEDED. Other food that individuals may 'want', such as meats, are left up to the individual to acquire.
Perhaps an individual has an idea about industry. That individual has direct and immediate access to the head office so as to confer about that idea. All individuals play an objective part outside of industry because they are not a part "inside" industry.
Gone are the days of salesmen 'pitching their wares'. Magazines ads, TV ads, radio ads, billboards, banner ads, sponsorships, lobbyists, product 'tie-ins', movie product placements, "celebrity" endorsements, telephone solicitors, door-to-door-sales, et al. Never to happen again.
Many more details. But that's the basic idea. Period.
Now, back to the current situation on the planet.
Humans are getting their collective a***s kicked by industry. Many individuals perceive that industry is in control and many individuals within industry perhaps believe that they are in control. Chaos is everywhere because industry (action) is at the helm, and it does not belong there. Non-action (objectivity) belongs at the helm, that rules all industry.
The fox has been in charge of the hen-house for all of history, and the hen-house is in ruin, almost beyond the point of no repair. Almost.
For the hen-house to survive (and ultimately the fox), the fox must be put in its place. OUTSIDE the hen-house.
I guess that's about it. I'll be in my ready-room. You have the comm #1.