Ray Andraka wrote:
More likely, the increase is due to the decrease in forests which absorb
the CO2 and release oxygen in exchange. Still it can be traced back to
human activity, but not due to emissions...the decrease in the scrubbing
capacity due to deforestation is much greater than the small percentage
increase in emissions due to human activity. Same is likely true of
global warming.

Just FYI, the impact of deforestation on atmospheric CO2 content is
discussed he
http://www.realclimate.org/index.php?p=160