I'm just saying unless it's brewed and steeped you won't derive all the benefits of green tea. I remember being told doesn't matter if you like it cold but you need all the chemicals to come out of the leaves otherwise you'll just have water and leaves. I also remember learning in chem class hotter water has a higher solubility. Anyway Green tea is a known boost to metabolism in addition to the water it makes you consume.
My apologies if I confused you by saying sweating. The best way I can put it is now that Ephedra has run into a couple problems with the FDA most of those supplements have added green tea extract which is said to be just a little less effective.