“One scientific paper reports that the soil structure has been damaged in 75% of fields used for growing maize, sampled in south-west England. Partly because of the loss of carbon as the soil is washed away, biogas made from maize is likely to cause more greenhouse gas emissions than burning fossil methane. An estimate in Germany suggests that in some cases its emissions are comparable to burning coal”
https://www.monbiot.com/2023/03/09/the-hunger-gap/