translation.en: The green areas here show where corn yields, just showing corn as an example, are already really high, probably the maximum you could find on Earth today for that climate and soil, but the brown areas and yellow areas are places where we're only getting maybe 20 or 30 percent of the yield you should be able to get.
translation.zh: 绿色部分代表玉米产区 显示以玉米来说 目前产量已相当高的地区，或许是目前世上 产量最高的地区，以气候和土质来说 但咖啡色和黄色部份是 仅可获得 20% 或 30% 产量的地区