Why do naturalist suggest that we plant more trees?

APlants use CO2 but do not release any thus maintaining a balance of CO2 in the atomsphere

BPlants release CO2 through respiration and use it for photosynthesis, thus decreasing the amount of CO2 and maintaining its balance in the atmosphere.

CPlants do not use any CO2, thus maintaining low levels of CO2 and balance its level in the atmosphere