Radiocarbon Dating is used on organic objects only, so the fact that your whole example is based on inorganic rocks and radio carbon dating only suggests that you do not know with any detail or understanding the topic that you are discussing.
There are 2 calories in 1 cup of Unsweetened Iced Tea. Calorie breakdown: 0% fat, 97% carbs, 3% protein.
Well, not at Starbucks. There, your tall iced coffee (unless ordered unsweetened) contains a shot of simple syrup and around 90 calories. Still, since coffee in this country doesn't usually come pre-sugared, it's a little surprising. I've been a part of Serious Eats since 2006, when I was Ed Levine's first intern.