Starbucks faces challenges in reviving its business, CEO Brian Niccol said on Tuesday, after the coffee giant posted disappointing global comparable sales and profit with inflation and economic uncertainty driving up costs and dampening U.

Starbucks came in short of estimates in its fiscal Q2. CEO Brian Niccol still says the 'Back to Starbucks' strategy is progressing well.

Key Takeaways Starbucks CEO Brian Niccol said recent earnings were disappointing, but he's confident the company's Back to Starbucks turnaround campaign is working.The cafe chain is using algorithms and new labor models to speed up service,