Scientist have discovered another use for farm soil – isolating carbon dioxide and reducing global warming.
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Soil around the world holds approximately 4,800 petagrams (one petagram is a trillion kilograms) of carbon. This is six times the amount which is held by the atmosphere (830 petagrams). However, scientists from Cornell University believe it could hold even more, if the right techniques were used.
The co-author of the study, Dr Johannes Lehmann had this to say about the research: We can substantially reduce atmospheric carbon by using soil. We have the technology now to begin employing good soil practices to reduce greenhouse gas emissions.”
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Scientists believe that a decrease in greenhouse emissions and prudent agricultural management could result in enhanced soil fertility and biodiversity. It would also reduce erosion, water pollution and runoff. Avoiding the breakdown of native ecosystems and returning marginal land to either grassland or a perennial forest could also reduce global warming.
Dr Johannes Lehmann continued: “Improving prediction models, finding ‘big data’ approaches to integrate land use, soil management and technology to engage land users are key parts to realizing greenhouse gas mitigation from climate-smart agricultural soils.”
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For these changes to be implemented political, cultural and socio-economic contacts across different countries must be understood in order for worldwide change.
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Lehmann added: “The mitigation potential of existing and future soil management practices could be as high as eight petagrams per year, but how much is achievable depends on the implementation strategies, and socio-economic and policy constraints.”
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