De or het wereldsamenleving?

The correct Dutch article is:

de wereldsamenleving

Rule Words ending in -ing: almost always de. See the rule

How to use wereldsamenleving

the wereldsamenlevingde wereldsamenleving
this wereldsamenlevingdeze wereldsamenleving
that wereldsamenlevingdie wereldsamenleving
our wereldsamenlevingonze wereldsamenleving
your wereldsamenlevingjouw wereldsamenleving
every wereldsamenlevingelke wereldsamenleving
which wereldsamenleving?welke wereldsamenleving?
a big wereldsamenleving / the big wereldsamenlevingeen grote wereldsamenleving, de grote wereldsamenleving