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

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\(_2\).