Answer:
B. Plant more trees in the temperate zone.
Step-by-step explanation:
The presence of abundant cabondioxide (CO2) in the atmosphere is as result of a decrease in plants populations.
plants makes use of CO2 in photosynthesis a process in which green plants manufacture their food Abundance of trees helps to clear the environment from excess CO2 through their utilization leading to a fresh and enabling environment.
Hence their is need to plant more trees in temperate and avoid deforestation of trees to enable plant make of CO2 and reduced the adverse effect of its excess in the environment.