One thing I've learned from suffering from bronchitis and pneumonia and bad sinus infections in the past, anytime there is green coming out of your body means there is a bacterial infection. In other words, not good. Although I never advocate the use of antibiotics, this is the one time they are needed.

Now if you see green only in the morning (ie your fluid is clear in the afternoon and evening) that's OK, although having a cold or cough longer than 10 days is always bad. If your "fluids" are always green, then you really need to see a doctor. A number of years ago I ignored the symptoms and was hospitalized for pneumonia. My sister wouldn't go and just got out of the hospital because of plurisy (sp?). Not trying to scare you, but green boogies are always a bad sign!