He noted that most of the world's total carbon emissions stem from cities and sources like buildings, transportation and waste, over which at least limited control can be exerted.
他注意到全球所有碳排放都来自于城市和建筑、交通以及废弃物等来源，对这些来源至少可以加以控制。
Total quantity control means limiting measures that are formulated for total allowable emissions quantities of air pollutants within a certain area in order to effectively improve air quality.
总量管制：指在一定区域内，为有效改善空气品质，对于该区域空气污染物总容许排放数量所作之限制措施。
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