过去数十年，我们花费了数千万美元。
We're spending tens of millions of dollars over the decades.
但由于在过去数十年人口增加渐缓，人类消费的增幅也相对回落。
But the increase in human consumption has been slowing for decades as population growth moderates.
就2000年到2009年这十年来说，经济的增速较过去数十年偏低。
Taking the decade between 2000 and 2009 as a whole, growth was slower than in previous decades.
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