I was thinking the same thing. Lead by example. Let's see the cardinals, bishops, and the pope be the first by cracking open the vault of the Catholic church. My guess is there is enough in wealth in them to feed all of Africa for years at least!
Not to mention hiring enough professional architects, teachers, civil engineers, dieticians, and the like to teach the poor how to do it right.
Kind of a "teach 'em to fish" approach.
At any rate, the money is certainly there; all the church has to do is decide to spend it on the poor instead of themselves.
Fat chance.