Since trees absorb and hold carbon dioxide when they are growing and release it when they are cut down and destroyed, afforestation, reforestation and deforestation all have to be taken into account.
(trees; absorb; ) (they; destroyed; ) (they; are growing; ) (all; to be taken; into account) (they; are cut down; )
trees they they all they
absorb destroyed are growing to be taken are cut down
into account