Starbucks is betting bubbles will give sales some sparkle

Two of the new bubbly drinks from Starbucks. Starbucks Starbuck is testing new carbonated versions of its popular refresher drinks in select markets. Non-coffee drinks are playing a key role in Starbucks growth, especially among younger customers. The company said its refreshers line is delivering double-digit year-over-year growth. Starbucks CEO Brian Niccol is ready for some fizz. The company is testing a carbonated version of its Refreshers, which are iced juice and tea drinks often mixed…