Final answer:
Agroforestry provides several benefits, but it does not directly reduce atmospheric CO2 levels. Therefore, the correct option is C.
Step-by-step explanation:
The correct answer is Reduction in atmospheric CO2. Agroforestry is a land management system that combines trees/pasture farming to create multiple benefits. It is a low-cost solution that enhances the resilience of smallholder farms, increases organic matter in the soil, and reduces non-point source pollution.
However, it does not directly reduce atmospheric CO2 levels as it mainly focuses on sequestering carbon in the soil and mitigating climate risks.