Poverty, the state of one who lacks a usual or socially acceptable amount of money or material possessions.
You don't need to define what poverty is. Besides, this sentence is flawed. Actually, I think starting your essay with your second paragraph is better.
perspective of the working poor. Without jobs,
So... Are you referring to "the working poor" or to the people without jobs? The two cannot be the same.
My interactions with staff and the stories I have heard have left me with a great hunger to change this injustice.
So it was the staff that inspired you to help the poor? That's the first time you mentinoned "staff and the stories." I mean, weren't the plights of the poor you witnessed that motivated you? This is very strange...
the stories I have heard have left me with a great hunger to change this injustice.
These interactions let me know that it is my duty to do more.
These two essentially talk about the same thing.
You should organize your ideas more and think about what to add and what to subtract from this essay. I suggest you focus more on describing your experience with "food pantries" and the lessons you learned.
Martin Luther King Jr. said that "an injustice anywhere is a threat to justice everywhere."
This is a great quote to use in this kind of essay, btw.