It has been argued that cutting old-growth forests and replacing them with plantations of young trees would to alleviate the threat of global warming. what important fact does this argument ignore?

a) most of the young trees would die within a few years
b) forests play too minor a role in global co2 dynamics, which are affected far more by marine algae
c) most of the bio mass of the cut trees would be added to the atmosphere as co2 within a few years
d) young trees fix carbon at a slower rate per unit mass than old trees