It describes events in past simple tense. It describes circumstances and situations in present simple tense.
I am afraid I would have to start
we do not really need a world government.
a single government elected by the people of the world
People are worried about the situation with Iran and some kind of wider conflict happening there
probably from the point of view of the United States is the thing that we would be most concerned about.
The current structure of world institutions is not fair.
Asians are sixty five per cent of the world population.
I think it is an issue that understandably and legitimately is raised by the nations with a smaller percentage
the world situation was a totally different one…
This should be addressed.