Hi Kassie,
I just noticed that you started another thread asking if eating sweets occasionally will promote weight loss, and here you are wondering the same about green tea. Well, actually, if you ate sweets in major moderation and drank a quart or so of green tea a day, and in doing so, ate no more than 1500-1600 calories a day, faithfully without going over...with minimal excercise, yes you would lose weight. It's magic!
Seriously, I'm not trying to be snarky, but really the only way to lose weight is to eat fewer calories than you need for basic function. Your body will then start burning excess fat as fuel. It really is a very simple concept.
Good luck.