I know that a single human can knock down every wall. 我知道一个人就足以推到每面墙
How can this century carry the burden of nine billion human beings... 这个世纪怎么负起九十亿人的重压
With consequences no one can predict. 其结果无人能预知
We can still extract oil from the tar sands of canada. 我们仍可从加拿大的含油沙中提炼石油
that we can no longer live without. 生活中已经无法缺少的资源
Can such disparities be maintained? 这种差异还能维持吗
Haiti can no longer feed its population without foreign aid. 如今却要依赖外国援助才能养活人♥民♥
How long can this mirage continue to prosper? 这种蜃景还能繁荣多久
Can we envision the inconceivable? 我们能预知无法预料的事情吗