Green tea, widely touted for its health boosting antioxidants, has become increasingly popular across the country in the last few years; it was only a matter of time before Starbucks started carrying it. Today the coffee chain introduces a new line of green-tea iced beverages, available through September 30.The line consists of three drinks, made with green tea from the tea company Tazo, which Starbucks owns: Green Tea Frappuccino Blended Creme, Shaken Green Iced Tea, and Shaken Green Tea Lemonade. All three can be ordered sweetened or unsweetened. Our favorite was the Green Tea Lemonade ($2.90 for a grande, or medium size) – the lemonade adds a refreshing sweet-tart tang to the green tea. The Shaken Green Iced Tea (shaking apparently “aerates” the drink and brings out the full flavor of the ingredients) has a fairly subtle, clean taste, although we felt it was overpowered by the sweetener – it might be better to order it unsweetened and add a bit of sugar to taste ($1.95 for a grande).The Green Tea Frappuccino Blended Creme ($4.66 for a grande), first introduced by Starbucks in Taiwan and Singapore in 2001, is delicious, but can hardly be counted as a health drink: If ordered with sweetener and whipped cream, a grande has 510 calories, 17 grams of fat, and 73 carbohydrate grams (without the whipped cream and sweetener, it drops down to 320 calories, 5 grams of fat, and 55 carbohydrate grams). It tastes quite a bit like a milkshake.