如果拥有两个孩子，假设一位美国妇女开节能型汽车，减少开车，使用回收用品，安装节能灯泡和节能窗户，还是会造成“近40倍于她的这些活动所节约”的伤害。
By having two children, a hypothetical American woman who switches to a fuel-efficient car, drives less, recycles, installs efficient light bulbs and energy-saving windows, would do as much damage as “nearly 40 times what she had saved by those actions.”