I've made it clear before this is the reason we must fully convert to and currently support organic agriculture.THE SOIL is in crisis without it and we all know what comes from the soil.There is a great documentary out there called DIRT,you may want to check it out.

Vanishing topsoil will lead to food crisis
http://www.naturalnews.com/029176_topso ... ction.html
All the world's topsoil is set to vanish within the next century if current patterns do not change, according to a study conducted by researchers from the University of Sydney and presented at the Carbon Farming conference.

"It could be as little as 60 years and that is a scary figure because it is not obvious that we have time to reverse decline and still meet future demands for food," researcher John Crawford said.

The soil-depleting effects of chronic mismanagement, including overuse of plowing, overapplication of synthetic fertilizers, poor erosion control and unsustainable farming (such as in former tropical rainforests), are being exacerbated by global warming and development. Coupled with a growing world population, this poses a recipe for food disaster.

The study found that in Australia, soil is being lost five times faster than it is regenerating through natural processes. In the United States, it is being lost 10 times faster. In Europe it is being lost 17 times faster, and in China, an astonishing 57 times faster.

Britain facing food crisis as world's soil 'vanishes in 60 years'
http://www.telegraph.co.uk/earth/agricu ... years.html