The reduction in biomass( deforestation) has a definite effect on the overall CO2 levels in the atmosphere. Trees and other biomass act as a CO2 sink and absorb the atmospheric CO2. However, in terms of the overall CO2 levels in the atmosphere the biggest cause is humans burning fossil fuels. “deforestation and forest degradation emissions contribute about 12% of total anthropogenic CO2 emissions”
http://www.biology.duke.edu/jackson/ng09.pdf
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