Peak Water, Peak Oil…Now, Peak Soil?

soilStephan Leahy writes at IPS:

Soil is becoming endangered.This reality needs to be part of our collective awareness in order to feed nine billion people by 2050, say experts meeting here in Reykjavík.

And a big part of reversing soil decline is carbon, the same element that is overheating the planet.

“Keeping and putting carbon in its rightful place” needs to be the mantra for humanity if we want to continue to eat, drink and combat global warming, concluded 200 researchers from more than 30 countries.

“There is no life without soil,” said Anne Glover, chief scientific advisor to the European Commission.

“While soil is invisible to most people it provides an estimated 1.5 to 13 trillion dollars in ecosystem services annually,” Glover said at the Soil Carbon Sequestration conference that ended this week.

The dirt beneath our feet is a nearly magical world filled with tiny, wondrous creatures. A mere handful of soil might contain a half million different species including ants, earthworms, fungi, bacteria and other microorganisms. Soil provides nearly all of our food – only one percent of our calories come from the oceans, she said.

Soil also gives life to all of the world’s plants that supply us with much of our oxygen, another important ecosystem service. Soil cleans water, keeps contaminants out of streams and lakes, and prevents flooding. Soil can also absorb huge amounts of carbon, second only to the oceans.

“It takes half a millennia to build two centimetres of living soil and only seconds to destroy it,” Glover said.

Each year, 12 million hectares of land, where 20 million tonnes of grain could have been grown, are lost to land degradation. In the past 40 years, 30 percent of the planet’s arable (food-producing) land has become unproductive due to erosion. Unless this trend is reversed soon, feeding the world’s growing population will be impossible.

The world will likely need “60 percent more food calories in 2050 than in 2006″, according to a new paper released May 30 by the World Resources Institute. Reaching this goal while maintaining economic growth and environmental sustainability is one of the most important global challenges of our time, it concludes.

Urban development is a growing factor in loss of arable lands. One million city dwellers occupy 40,000 hectares of land on average, said Rattan Lal of Ohio State University.

Plowing, removal of crop residues after harvest, and overgrazing all leave soil naked and vulnerable to wind and rain, resulting in gradual, often unnoticed erosion of soil. This is like tire wear on your car – unless given the attention and respect it deserves, catastrophe is only a matter of time.

Erosion also puts carbon into the air where it contributes to climate change. But with good agricultural practices like using seed drills instead of plows, planting cover crops and leaving crop residues, soils can go from a carbon source to a carbon solution, he said.

“Soil can be a safe place where huge amounts of carbon from the atmosphere could be sequestered,” Lal told IPS.

When a plant grows it takes CO2 out the atmosphere and releases oxygen. The more of a crop – maize, soy or vegetable – that remains after harvest, the more carbon is returned to the soil. This carbon is mainly found in humus – the rich organic material from decay of plant material. Soil needs to contain just 1.5 percent carbon to be healthy and resilient – more capable of withstanding drought and other harsh conditions.

“Healthy soils equals healthy crops, healthy livestock and healthy people,” Lal said.

However, most soils suffer from 30 to 60 percent loss in soil carbon. “Soils are like a bank account. You should only draw out what you put in. Soils are badly overdrawn in most places.”

Farmers and pastoralists (ranchers) could do “miracles” in keeping carbon in the soil and helping to pull carbon out of the atmosphere and feed the world if they were properly supported, Lal said.

Read more here.

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  • Anarchy Pony

    Don’t worry, we’ll all be robots/computer programs soon so there’s nothing to see here move along.

    • I_abide

      The rich will be robotic. The rest of us will be back to serfdom.

      • Anarchy Pony

        The rest will probably be left to starve to death.

        • alizardx

          Wouldn’t be the first time the wealthy have decided they can get along just fine without the rest of us. In the good old days, they discovered wealth that can’t be traded for food isn’t wealth. In the future, their robotic selves will find themselves in a world where they can’t buy spare parts.

          The price and even existence of electronic devices depend on a VERY large consumer market to provide the volume of scale required to make possible the vendor networks required to turn blobs of coltan found on the ground in African jungles into tantalum capacitors (for instance).

          • Anarchy Pony

            I’m not really saying it’s very likely, it’s more like an attractive fantasy bought into by egomaniacal techno-utopians.

          • alizardx

            As the Boomer generation of technocapitalists notice they’re seeing their peers more and more in obits instead of multimillion dollar parties and conferences, if the problems of drastically extending life can be solved by throwing money at them, it’s going to happen.

            From what I know of them, I suspect that the R&D money that will be thrown will be tax dollars, for services that only the wealthy will be able to afford. Something to think of the next time you hear words like Transhumanism, Singularity, Kurzweil, or Theil.

  • http://hormeticminds.blogspot.com/ Chaorder Gradient

    i always get a tickle out of people telling me how much “money” is made by a natural entity that’s been around since long before the concept of money

  • alizardx

    Google on “terra preta”. South American natives figured out how to build soil more or less from scratch 2500 years ago.

  • BuzzCoastin

    “It takes half a millennia to build two centimetres of living soil
    and only seconds to destroy it,” Glover said.

    the problem with this statement is
    that it leads one to believe it’s a hopeless situation
    but it’s not
    soil is actually pretty easy to repair and rebuild
    but
    it can’t be repaired and rebuilt
    unless we make some radical changes in the way we farm
    if wee don’t
    the Great North American Desert awaits a not too distant future generation

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