Human affect greenhouse gas levels by introducing new sources or by interfering with natural sinks 人类的活动可直接影响各种温室气体的源和汇而因此改变了其浓度。
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Sources and sinks are processes that generate and destroy greenhouse gases respectively . human affect greenhouse gas levels by introducing new sources or by interfering with natural sinks ‘源’是指某些化学或物理过程使到温室气体浓度增加，相反‘汇’是令其减少。
