Personally, I lean to the biosphere. Look at this:
http://www.cotf.edu/ete/modules/msese/earthsysflr/spheres.html
I suppose it boils down to what you mean as pollution. But if the pollution doesn't affect living things, who cares?
Can someone point me in the direction of information relating to: "Which earth spere is most affected by pollution?"
I am leaning to atmosphere - due to global warming, but I would like to do more research. Thanks for the help.
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