I wont deny there have been improvements in some areas in some parts of the world because of the knowledge we've aquired. We are pretty clever creatures after all with things like pyramids and medicine and technology.
Usually things like poverty and food shoratges are sometimes political and sociological issues and not necessarily issues of money and farmable land. (Then there is the possibility of soylent green after all

)
And there is a whole solar system of resources available if we can figure a way of making it practical.