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CO2 fertilization effect signifies...

`CO_2` fertilization effect signifies

A

Higher yields, if some `C_3` crops are allowed to grow in `CO_2` enriched atmosphere

B

Effect of `CO_2` on double fertilization event

C

Lower yields, if `C_3` crops are grown in `CO_2` enriched atmosphere

D

Both (1) and (2)

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