人们需要更多的能源支持更大的城市运转和经济增长，从而导致了水坝的建设，随之而来的生态系统的洪水，以及污染物的排放增加。
The need for more energy to power larger cities and economic growth therein leads to the construction of dams, the consequent flooding of ecosystems, and increased emissions of pollutants.
一些经济大国已经做出的承诺，而要实现这些承诺就必须具备巨大的人力物力，以便在短时间内迅速建立起新的能源系统。
The commitments already made by some large economies require an extremely large capacity to get new energy systems in place quickly.
这笔费用，无论是税费还是一种可交易的污染许可系统，将会从根本上改变能源经济。
Such a charge, whether a tax or a system of tradable permits to pollute, would change energy economics radically.
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