Some critics warn, this will be at a high cost to the Earth: "the technological optimists are probably correct in claiming that overall world food production can be increased substantially over the next few decades... the environmental cost of what Paul R. and Anne H. Ehrlich describe as 'turning the Earth into a giant human feedlot' could be severe.
一些批评者警戒这个成本高昂：“就未来几十年全球食物增产来说，技术乐观主义者可能不错...保罗·R和安·H·欧利希所描述的‘将地球变成巨型人类饲养场’的环境成本会很严峻。