The value of soil

One Billion Hungry: Can We Feed the World?

ID-10064167“For all things come from earth, and all things end by becoming earth.” Xenophanes, 580 B.C. You could, in reading this quote, be mistaken in thinking that the soil is a regenerating, renewable resource. Soil is formed from slowly decomposing rocks, sediment and organic matter. This process is so slow in fact that it takes 2,000 years to build 10cm of topsoil, such an unhurried rate of growth that soil should be thought of as finite, non-renewable and a resource that needs to be protected.

Healthy soils provide a variety of ecosystem services such as nutrient cycling, water regulation, flood protection, habitats for biodiversity and food production. For approximately 1 to 1.5 billion people in the world land degradation is reducing some of these services, negatively impacting their quality of life and livelihoods.

So far we haven’t been doing a very good job of protecting the soil. We overuse and…

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