as for colour of stool - it depends on what you've been eating. or if you have a bit of a cold/flu. As for urine its just consintrated. YOu need to be drinking more fluids. The more you drink the lighter it will be
I would talk to the doctor right away.. Green stools, unless you've been piling on Spinach or green leafy veggies, sounds like concerning.
If it has been persisting, please call your health care provider at the earliest. Good Luck!