Starbucks recently announced plans to cut carbon emissions, waste, and water usage. But, as CEO Kevin Johnson tells Alan Murray in the newest episode of Leadership Next, he's not 100 percent sure how the company will meet those goals.

Enter Andrew Wanliss-Orlebar, VP Strategy at Futerra, who advises companies on their sustainability policies. He lays out some of the challenges that Starbucks and other companies face in their quests to protect the planet.

 Also in the episode: find out just how much coffee Johnson drinks throughout the day, and how reading to his grandson impacted Starbucks corporate policy.