vtskier 加入本网站时间 Member Since 28 April 2012 Vtskier's 评论 comments 可持续性，粮食和燃料 液态或气态碳氢燃料是否可持续的关键问题在于“其氢和碳来自哪里？”如果来自史前地下存贮，则为非可持续，最终将消耗殆尽。如果来自空气和水，则为可持续能源。 据此，长远来看，石油，煤炭和天然气都不是可持续能源，而中国喜欢着眼未来。不依托食物来源和非占用农田的生物能源将行之有效。生物降解可提供持续的乙醇，甲醇和甲烷（见生物沼气第三章：中国沼气指南）。 大卫·布鲁姆的《酒精制燃气》一书对此颇有见解。在中国，尤其是相关领导人应该阅读这本书。它绘制出一个路线，以可持续农业为核心的体系可以使中国可以实现粮食和能源安全。 Sustainability, food, and fuels The key question on the sustainability of a liquid or gaseous hydrocarbon fuel is "where does it get its hydrogen and carbon from?" If it gets them from prehistoric subterranean deposits then it is not sustainable. They will run out eventually. If it gets them from the air and water then it is sustainable. By this logic, oil, coal, and natural gas are all not sustainable, particularly in the long range. China is much more experienced in long range thinking. Bio-fuels that are based on non-food feedstocks, especially ones that do not use farmland are available. Ethanol, methanol, and methane from biodigesters are sustainable (see Biogas Volume 3: A Chinese Biogas Manual). A highly recommended book on this is Alcohol Can Be A Gas by David Blume. This book should be read by many in China, especially people in leadership roles. It maps out a course that China can use to reach food and energy security using a permaculture-centered system.