--- On Mon, 20/7/09, Martin Koppenhoefer <dieterdre...@gmail.com> wrote:

> we ourselves could not live on (as living things are
> interacting more
> intense with their environment as e.g. sand does - heard
> of
> evaporation, photosynthesis, oxygen and stuff?)

A lot of which comes from the ocean and organisms living in it, once trees 
reach a certain stage they don't capture as much carbon dioxide as young trees 
do. Also at night trees exhale carbon dioxide.


      

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