目前生态学家谈论最多的话题是：温度效应将使地球气温急剧上升，造成南北极冰雪融化，沿海大片土地将全部淹没。有人则认为，CO₂浓度增加导致气温上升将使植物光合作用能力相应提高，可以促进农业的发展。再者，由于绿色植物反馈调节的影响，结果也绝不会那样严重。

　　学者们通过精密的实验对以上说法持有以下见解。他们说，按一般理论，大气中的CO₂含量的增加，会促进光合作用；植物因此生长加快并净化环境将是情理之中的事。但事实却是：在CO₂富集的环境中，绿色植物往往在开始时光合作用效率有些增长，但不久就缓慢下降，直至接近于正常CO₂含量时的状况。即使光合作用随着CO₂的增加而提高，与植物生长加快也不一定存在必然性，因为这要受到诸多因素的影响。有的学者还担心，温室效应使得寒冷地区部分冻结着的泥炭解冻后暴露给分解菌，以细菌的作用而释放出的CO₂数量十分可观，如果算笔总账，还真有点“得不偿失”呢!

　　如果学者们的论证是无懈可击的话，那么，把环境保护的希望寄托于绿色植物自净作用的认识，

对第二段末尾的“如果算笔总账，还真有点‘得不偿失’呢”这句话，理解正确的是（）。

A．即使光合作用随着CO₂含量的增加而提高，与植物生长加快也不一定存在必然性

B．地球上温室效应带来的好处远远赶不上其带来的危害

C．细菌作用而释放出的CO₂数量显然十分可观，但仍不能满足植物光合作用对CO₂的需求

D．植物光合作用时CO₂的吸收量不如细菌分解作用后释放的CO2的数量多

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