For a long time, the relationship between humans and the planet... 很长一段时间里 人类和地球的关系

217. Over one and a half billion human beings-
     也就是超过15亿人类的经历
218. More than the combined population of all the wealthy nations.
     这一数字超过了所有富裕国家的人口总和
219. Taking from the earth only the strictly necessary.
     仅仅向地球索取必需品
220. For a long time, the relationship between humans and the planet...
     很长一段时间里 人类和地球的关系
221. Was evenly balanced.
     是平衡的
222. For a long time,
     很长一段时间里
223. the economy seemed like a natural and equitable alliance.
     经济似乎是自然平衡的联盟

来自《家园 第一部分 Home Part1》第 220 行