The increasing amount in the atmosphere seems to be most directly connected with increasing human activity, particularly the burning of fossil fuels and wood.
(The increasing amount in the atmosphere; seems; ) (The increasing amount in the atmosphere; to be; most directly connected with increasing human activity) (The increasing amount in the atmosphere; most directly connected; )
The increasing amount in the atmosphere The increasing amount in the atmosphere The increasing amount in the atmosphere
seems to be most directly connected
most directly connected with increasing human activity