他说我们整个文明依赖于环境——洁净的空气，水源，土地和食物。
He says our whole civilization depends on the environment - on clean air, water, soil and food.
在其他条件相同的情况下，这意味着他们必须开拓出比农学家更大的土地面积，以获得相同数量的食物、衣服和其他必需品。
All else being equal, this means they must exploit larger areas of land than do agriculturalists to secure the same amount of food, clothing, and other necessities.
浪费食物不仅意味着失去维持生命的营养，还意味着失去宝贵的资源，包括土地、水和能源。
Wasting food means losing not only life-supporting nutrition but also precious resources, including land, water and energy.
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