Probably only 1% green tea...
Or maybe the liquid from green tea leaves + water, and maybe a bit of green tea powder or green tea frustose syrup... actually most likely frustose syrup since Coca-Cola itself is made from a syrup concentrate, so why not green tea flavour syrup?
maybe. i dont see the point unless it actually tastes a bit like green tea though. (even though green tea flavoured coke doesnt sound appealing to me!) .....like to have a sip though... :)