Implications for Climate Change Policies
New research shows oxygen depletion in the atmosphere accelerating since 2003, coinciding with the biofuels boom; climate policies that focus exclusively on carbon sequestration could be disastrous for all oxygen-breathing organisms including humans Dr. Mae-Wan Ho
"First, O2 is there principally because of carbon storage time,its rate of drop currently is ~10 ppm, but it could well swing further downwards."
CO2 increase is just 1.8 ppm per annum.
Therefore reducing the decline in O2 by 50% to 5 ppm per annum using photosynthesis will stop the increase in CO2 level of atmosphere.