I assume green is the increase in rep, but what's the red? I see 0s or negatives. No idea what they mean. Can a link be added to explain?
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Red represents a loss of repuation from anything, not just downvotes, this includes:
Red is for down-votes. You will see -2 for every down-vote someone gives you, and -1 for every down-vote you give. -100 for for questions/answers flagged offensive. It will also include any bounties you have set.
I don't think this has been discussed, so I'm not sure I can find a link to add.