Plants, through photosynthesis, build their bodies from the carbon in CO2  
and give off the oxygen. Possibly higher CO2 levels from burning fossil 
fuels  will lead to accelerated vegetation cover of the Earth which, through 
deposits  of leaves, trunks etc, as well as mosses, ferns, phytoplankton etc 
will, in  the very long term, trap the carbon in fossilised layers and so the 
wheel will  turn again. It may just be possible that some humanoid creatures 
will still be  around then.  With their track record, bees are more likely 
to be around  than we are!
 
Chris (It's being so cheerful as keeps me  going!)

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