沼气池真的是奶牛场减排的可行方案吗？

Converting manure to biogas reduces methane emissions from livestock, but the process can also have some negative side effects, finds Alec Luhn WHEN fuel ran out during the second world war, some farmers in Germany and France made their own by covering cisterns of manure and capturing the methane that was generated. Anaerobic digesters (below) are becoming a more common sight on dairy farms Now, governments are pushing an upgraded version of that technology, called an anaerobic digester, as a way to reduce dairy farms’ greenhouse gas emissions. But some researchers say spending on digesters could have unintended consequences for the climate and human health. …