And one of the ways I like to do that is to look back at the stories people used to tell before we had cheap oil, before we had fossil fuels, and people relied on their own muscle, animal muscle energy, or a little bit of wind, little bit of water energy.
我喜欢的方法之一是 回首往事时人们通常这么说： 在拥有便宜的汽油和化石燃料之前， 人们依赖于他们的肌肉，动物肌肉中的能量， 或者一些风能，一些水能。