RSK,
I'm sure we're cross-posting, so you may answer some of this already.
As far as the numbers go about world overpopulation in relation to available land and resources go, you are likely not off base. But, the problem occurs when you look at populations within various smaller pieces of land...nations primarily. The totality of the world's resources are not available in any given place, and a community must be able to provide a basic level of resources to sustain itself or it is not viable. In other words, we cannot ship water from the Edwards Aquifer (San Antonio) to any country in Nyambe....err, Africa. Nor can shipping food 8,000 miles be a permanent solution.
And again, one of the main problems is these countries' failure to make the leap into fully industrialized countries, for a variety of reasons, none of which I would call racist.

They are taking advantage of modern technology without making the societal commitment to live as industrialized peoples. In many cases, overpopulation and disease are preventing this...in others, the blame falls on dictators and intra-culture racial wars (Tutsi vs. Hutu, etc.) that focus their attention elsewhere.
Billions and billions of dollars (I say dollars for a reason) flow to these nations each year, but the funds are primarily misapplied or simply a stop-gap against the growing AIDS populations. In many African countries the adult AIDS population comprises 20-25% of the total population! This may be a self-corrective problem in 10 years or so, or it may only continue to spread.
In any case, overpopulation of certain regions is a huge drain on the world economy and is a big problem for those within it. Simply saying that there's enough food and land for everyone doesn't help those in need. It reminds me of the old Sam Kinison bit, "MOVE TO WHERE THE FOOD IS!" Although I'm sure you didn't mean it that way.
