Edie: Globally, soils contain around twice the amount of carbon in the atmosphere and three times the amount found in vegetation, so soil is both “a source and a sink of greenhouse gases”, the report published last Thursday says. Describing the balance between the two functions as “very delicate”, it says: “If carbon is released from soil to the atmosphere or if methane and nitrous oxide emissions increase, climate change will be exacerbated. “On the other hand, if more carbon is …