But Anthony Trewavas, a biochemist at the University of Edinburgh, counters that organic farming actually requires more energy per tonne of food produced, because yields are lower and weeds are kept at bay by ploughing.

• 但是爱丁堡大学的安施欧尼.；崔瓦拉斯反对说，采用有机耕作方式每吨粮食实际上需要更多能源，因为产出更低而且耕作过程中还要拔除杂草。