在过去的30年中，全球受干旱影响的土地数量增加了一倍。
Around the world, the amount of land affected by drought has doubled in the past thirty years.
这又进而影响种植大豆的土地数量，对美国农民来说，种植玉米和大豆可以互换。
That in turn influences how much land is planted to soyabeans, which for American farmers are interchangeable with maize.
新西兰作家罗伯特和布伦达·威尔通过研究种植宠物(涉及范围从鹦鹉到猫和狗)食物所需的土地数量，得出这项研究结果。
New Zealand-based authors Robert and Brenda Vale base their findings on the amount of land needed to grow food for pets ranging from budgerigars to cats and dogs.
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