JAMB - Biology (2001 - No. 27)
Carbon (IV) oxide content of the atmosphere is least affected by
cutting down and clearing of forests
forest fires
burning of fossil fuels
plant and animal respiration
Paliwanag
Apart from cutting down and clearing of forests, in the other options,Carbon (IV) oxide content of the atmosphere is greatly affected.
When forests are cut down or burned, the stored carbon is released into the atmosphere as CO\(_2\).