a. O2-+O2-+2H+-->O2+H2O2
b. H2O2+H2O2-->O2+2H2O
Moreover, Conversely, when oxygen concentrations are higher, the atmosphere thickens and scatters more sunlight. As a result, there is less water vapor to trap heat. Adding the effects of oxygen during other time periods could lead to more accurate models of the planet's past, the researchers say. During oxygenic photosynthesis, light energy transfers electrons from water (H2O) taken up by plant roots to CO2 to form carbohydrates. In this transfer, CO2 is "reduced" or gains electrons, and water is "oxidized" or loses electrons. Oxygen is produced along with carbohydrates.
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