Why is CO2 compared to a fertilizer in Para. 3 ?

A．They both absorb light.

B．They both store heat.

C．They both help plants grow.

D．They both cause global warming.

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事实细节题。
文章第三段倒数第二句提到，大气中二氧化碳含量的增加，其作用就如同肥料一般，可以刺激植物生长。由此可知，之所以把二氧化碳比作肥料，是因为二者都有助于植物生长。故选C。

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