When our supermarkets have only two or three days' worth of food in them at any one time, often sustainability tends to focus on the energy efficiency of the freezers and on the packaging that the lettuces are wrapped up in.
在任何时候，当超市只有2，3天的食物储备时， 通常可持续理论关注于 冰箱的能效， 和包裹生菜的包装。