Correct answer: (B) Plant productivity is likely to increase through CO₂ fertilization
Explanation
Elevated CO₂ can stimulate photosynthesis, the CO₂-fertilization effect, so **B** is the intended answer. It is conditional: heat, drought and nutrient limitation can offset gains. Water vapour and CFCs are greenhouse gases; HFCs can have strong warming effects and HCFCs also deplete ozone.
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