Will found this. Chris Jordan gives you a little better idea of how people might have an impact on climate in a world this large... and other things about the scale of US life. Since there are now more people in the EU, I'm sure some of these could be done for Europe too (though of course even though China has five times the population of the US it has half the prison population...)
http://www.chrisjordan.com/current_set2.php
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