What is not a result of deforestation?

a. increased air pollution
b. increased greenhouse gases
c. increased nitrogen levels in ponds
d. increased erosion

I would say C increased nitrogen level in ponds would not result of deforestation.

C). Increased nitrogen levels in ponds

Explanation:

Deforestation occurs when the trees of the forest are cut down and that area is cleared permanently for the other uses like creating new farmland for livestock and for crops.

It causes a negative impact on the environment and may lead to soil erosion, and loss of habitat of animals living in that area. it also disturbs the environmental conditions.

The increased level of nutrients like nitrogen, phosphorous is caused due to leakage of fertilizers from the soil field into the pond by eutrophication.

Hence, the correct answer would be option C.