noun / verb
source
SORS/sɔːrs/
The origin from which something is obtained.
The spring emerging from the rock is the stream's source.

Etymology
Old French sourse named a rising or fountainhead. The image of water springing from a starting point connects naturally with the broader meaning of an origin or provider.
In context
you talk about overpopulation uh something that many people consider a source of world poverty
More examples
- Beans are a good source of protein.
- The reporter checks the story with two independent sources.
- We source our vegetables from nearby farms.
Forms
source · sources · sourced · sourcing