Earth Science/Chemistry Problem!?

Can anyone walk me through how to solve this problem? I'd very much appreciate the help!

Forests contain about 600 Gton(C) in the form of wood and leaves. Suppose that all the world's forests were to burn down simultaneously. By how much would atmospheric CO2 increase? By how much would O2 decrease? Express your answers using percentages. Assume that the equation for burning is the same of that for respiration.

Given:

The atmosphere is 21% O2 and 0.036% CO2
Mass of air = 5 x 10^21 g, and there is 29 g/mol of air
Respiration = CH2O + O2 -> CO2 + H2O

Thanks :)
 
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