电动汽车的支持者还提到电动车零尾气排放的特点，尽管在生产给汽车充电的电力能程中还是产生了温室气体排放。
Proponents ofelectric cars also point to their zero tailpipe emissions, though theelectricity to charge the cars creates emissions.
电力行业由于自身特点，总体能效的提高涉及生产、供应和使用各个方面。
The total efficiency increase of electricity refers to production, supply and use.
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