This is the 1522nd most frequent Portuguese word.
existentes
"Existing" or "that exist."
In this sentence, 'existentes' is used as an adjective describing the natural resources that currently exist.
Os recursos naturais existentes devem ser protegidos.
The existing natural resources must be protected.
Here, 'existentes' functions as an adjective for cultures, indicating those which are present or ongoing.
Devemos preservar as culturas existentes em nossa sociedade.
We must preserve the existing cultures in our society.
In this instance, 'existentes' modifies problems, referring to those that have been identified or are currently present.