It seems like you are going about this question the wrong way...
Looks to me as if you are phrasing the question with greed and happiness at polar opposites to each other, which isn't normally the case. I may simply be misunderstanding.
If not, however perhaps the more pressing question is:
Is it possible to separate happiness from greed?
It would seem that in human history there has never really been happines without some kind of greed, a greed for life, or a greed for material things. Lust is nothing more than greed, and the way that the human race has become so prevalent on this planet is through that form of greed.
In that vein,
Pro: Greed drives the Human condition, pushing our society forward, making us want more than we have.
Con: Greed makes it impossible for us to achieve a state of contentment, no happiness, but no saddness as well.
Feel free to disagree.
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Fact: Global levels of Oxygen are depleting.
Fact: Global levels Carbon Dioxide are increasing.
( icy hell)Mars<------ EARTH------>Venus( burning hell)
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