[tharkun__]

    So how do feed the Human population?

If you mismanage the resource you have, you will not be able to feed said human population. A dustbowl feeds 0 people. This is what happens in said parts of Africa. The well managed pasture or well managed tree'd Africa feeds whatever number > 0 it feeds. Bulldozing it all may feed some more people initially, especially w/ petroleum based fertilizer, causing population growth. Until it turns into said dustbowl and now you have an African country that is dependent on imports to survive and people are still suffering and dying of hunger. That's also what I meant with the single earth being capable of feeding these people. With the dustbowl American bulldozers created in Africa, they are dependent on imports of corn and rice and wheat. With trees growing again they can graze livestock and plant traditional millet that is well adapted to their parts of the world and feed themselves again.

    Stealth means ... great for chemical companies

I'd first go with Occam's Razor here. The simplest answer is probably that it's not a conspiracy but pure and simple greed. That's also where people like Gabe Brown might be able to get to people. While it creates healthy soil and is "good for the environment", in the talks I've seen he specifically touts the profits he's making with his methods. This might be the one 'trick' that works in the end.

    I dont know why more isnt spent pumping desalinated water into the deserts 

I've like to come back to the previous exhibit of Occam's Razor and money and greed. None of that seems like it's particularly cheap, effective - what would 'flooding the desert' actually do? - or making any money.