[schiffern]

Topsoil erosion is already a massive problem.[1] So far we've been able to mask the damage by substituting fossil fuel inputs for soil fertility, but realistically soil husbandry is the only sustainable way to grow food.

Heck, many people nowadays aren't even aware that soil organisms can manufacture bio-available nutrients from local minerals and the air.[2] The dominant view of soil seems to be as an inert tank that needs to be "refilled" with imported fertility.

[1] http://www.fao.org/docrep/t0389e/t0389e02.htm

[2] http://www.youtube.com/watch?v=x2H60ritjag