I'm talking about the salinization of farm lands due to mono cropping and top soil abuse. Nothing can grow on salted earth, and AUS has lost a TON of it.
edit: I didn't read this whole article, but this should give you an idea what I'm talking about
http://www.abc.net.au/science/slab/salinity/default.htm
This is not as big of a problem as drought. Good top soil wont mean a thing is it will not rain.