As world population doubled from 3 billion to 6 billion, daily calorie consumption in poor countries increased from 1,932 to 2,650, and the percentage of people in those countries who were malnourished fell from 45% to 18%.
当世界人口从30亿增至60亿时，贫穷国家每日卡路里消费从1,932增至2,650，当地营养不良人口比率从45%降至18%。