See the yearly cycle in the Mauna Loa CO2 records. This is the annual growth/decay cycle of vegetation in the Northern Hemisphere (slightly modified by smaller amounts of land in the Southern Hemisphere).
Yes. Leaves grow then decay. The long term change is the growth in WOODY matter in the tree itself.
Despite this, we are pumping too much CO2 into the air and you can easily see the long term trend from the filtered data.
2.3 ppm more just in the last year, putting the lie to the claims of 'lower emissions'.
Facts are that the growth in emissions is still accelerating in reckless disregard for climate, the economy and lives.