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UK Research Flags Practical Problems with 4 Per 1000 Soil Carbon Initiative

February 11, 2018
Reading time: 2 minutes

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France’s “4 per 1000” soil carbon initiative, unveiled with some fanfare at the 2015 United Nations climate conference in Paris, could run into “severe limitations” in its practical application, the UK’s Rothamsted Research Institute concludes in a recent paper in the journal Global Change Biology.

“It’s a bit of a scientific dream, but we have a lot of evidence that supports this dream,” Jean-Paul Moatti, CEO of the French Research Institute for Development, told SciDevNet in December 2015. The project description for 4 Pour 1,000 stated that a 0.4% annual increase in carbon stocks in the top 40 centimetres of soil, plus an end to deforestation, would be enough to offset carbon emissions from human activity.

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But the Rothamsted researchers say France has been stepping back from that claim. The impetus behind the initiative was the hope “that if this rate of carbon sequestration was achieved for all soils globally to a depth of 40 centimetres, the carbon removed from the atmosphere would equal annual CO2 emissions from fossil fuels of 8.9 gigatonnes,” they write. But “later enunciations of the initiative” have been more cautious in their projections.

Based on increases in soil organic carbon in 16 long-term experiments in the southeastern UK, the researchers found that letting land lie fallow, retaining crop residues, and adding manure can indeed “increase SOC stocks, often at rates well above the 0.4% per year rate.”

However, they also identify “many situations where these practices cannot be widely adopted, either because they are impractical for farmers or because of wider global issues.” In particular, they note food security concerns that might arise on both local and global levels should too much land be set aside to sequester carbon with the express purpose of climate mitigation.

“A more logical rationale for promoting practices that increase SOC is the urgent need to preserve and improve the functioning of soils, both for sustainable food security and wider ecosystem services,” they conclude.



in Food Security & Agriculture, International Agencies & Studies, Soil & Natural Sequestration, UK & Europe

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Comments 4

  1. Stefhan Gordon says:
    5 years ago

    Please leave a link to the actual studies with the authors names. Thanks

    Reply
    • Mitchell Beer says:
      5 years ago

      Thanks, Stefhan. All our stories are linked to the original source. If you go to the top of the page and click the link for FULL STORY, you’ll get the material (or the main source, if we’ve drawn on more than one for a single post) that we used for reference.

      Reply
  2. William Grant says:
    5 years ago

    Letting fields lie fallow is only one method. There is also carbon farming, no-till agriculture, holistic rangeland management and rotational paddock grazing, This article takes one aspect and points to a problem, when the carbon soil solution is a web of methods.

    Reply
    • Nirmalya Chatterjee says:
      5 years ago

      As it is 30% of currently produced food is wasted – by FAO estimates – that is it doesn’t reach tables. Add to that many people are over-eating, which can offset the current on-table consumption of food. The net result is that the world already has the wherewithal to produce food for ~10-11 bn people. The issue has been food distribution and food habits rather than lack of food per se – and this has been the situation since the last 10-15 years.

      We really need to control our greed and wastefulness, and get on with these pretty achievable targets. There will be issues locally, seasonally and allowances will need to be made for political, social or economic diversity … but being fatalist or resigned about it is not going to serve the greater interests … and we have only one planet to live on.

      Reply

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