Firstly, Single ministry can allocate essential resource more accurately and effectively, Source, like medical equipment, natural resource, education facilities. For instance: - Lots of people have died in India during Covid breakout due to lack of oxygen, Although Pakistan was offering instance supply of oxygen cylinder to help Indian people. But Indian government had declined their offer because of bitterly relationship between two countries. Government could have saved so many lives if there would had been common authority in both countries.
Secondly, one leadership can control crime rate in better than national government all over the world by implementing same laws everywhere in the world. Due to different national government, some countries have tough laws and others have less penalties for same crime. For example: in Dubai, there is death penalty for rape but in India only 14 years of prison. In addition, government can make better programs to reform criminal by giving them work opportunity as a labour in another part of the world, not locally. Furthermore, situation in Afghanistan is good example of failure of national power in the country.
However, every coin has two sides, drawback of having one government can’t be ignored. Firstly, this won’t be easy to manage family of 7. 6 billion people by one government. Secondly, there are countless diverse cultures in the world and people have their needs and satisfaction according to their culture, sentiments and religion which national ministry understand more closely. Also, this would be not fair for people who are paying more tax but getting same facilities as less tax payer. On top of that, keeping an eye out on terror movements will be the biggest challenge for single government for safety of the people and to guard natural resource like oil.
In conclusion, one government can work in better way to develop every corner of the world by implementing good strategies of equal distribution and controlling crime by same laws in entire planet. On the other hand, it will be difficult for single authority to manage large population. plus, one governance can’t do justification for people paying more taxes than paying less. Overall, in my opinion, it will be great if we have one governance body to look after entire planet and will be more beneficial for public. 
 Firstly
, Single ministry can allocate essential resource more  
accurately
 and  
effectively
, Source, like medical equipment, natural resource, education facilities.  
For instance
:  
-
 Lots of  
people
 have  
died
 in India during  
Covid
 breakout due to lack of oxygen, Although Pakistan was offering instance supply of oxygen cylinder to  
help
 Indian  
people
.  
But
 Indian  
government
 had declined their offer  
because
 of  
bitterly
 relationship between two countries.  
Government
 could have saved  
so
  many
  lives
 if there would  
had
 been common authority in both countries. 
Secondly
, one leadership can control crime rate in better than  
national
  government
 all over the  
world
 by implementing same laws everywhere in the  
world
. Due to  
different
  national
  government
,  
some
 countries have tough laws  
and others
 have  
less
 penalties for same crime.  
For example
: in Dubai, there is death penalty for rape  
but
 in India  
only
 14 years of prison.  
In addition
,  
government
 can  
make
 better programs to reform criminal by giving them work opportunity as a  
labour
 in another part of the  
world
, not  
locally
.  
Furthermore
, situation in Afghanistan is  
good
 example of failure of  
national
 power in the country. 
However
, every coin has two sides, drawback of having one  
government
 can’t be  
ignored
.  
Firstly
, this won’t be easy to manage family of 7. 6 billion  
people
 by one  
government
.  
Secondly
, there are countless diverse cultures in the  
world
 and  
people
 have their needs and satisfaction according to their culture, sentiments and religion which  
national
 ministry understand more  
closely
.  
Also
, this would be not  
fair
 for  
people
 who are paying more tax  
but
 getting same facilities as less tax payer.  
On top of that
, keeping an eye out on terror movements will be the biggest challenge for single  
government
 for safety of the  
people
 and to guard natural resource like oil. 
In conclusion
, one  
government
 can work in better way to develop every corner of the  
world
 by implementing  
good
 strategies of equal distribution and controlling crime by same laws in entire planet.  
On the other hand
, it will be difficult for single authority to manage large population.  
plus
, one governance can’t do justification for  
people
 paying more taxes than paying less.  
Overall
, in my opinion, it will be great if we have one governance body to look after entire planet and will be more beneficial for public.