The one I forgot last night is the most important one: Population.
In the past, there were always classes in "Population and Demographics" - not anymore.
This may be the most important question of our time.
http://www.livescience.com/16493-people-planet-earth-support.html
When I was in college, there were 3 billion; today, there are 7 billion. Read that link to discover the max!
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