Starbucks' iconic cup faces climate challenge with surge in mobile and drive-thru orders.

Starbucks has committed to having all US store locations allow customers to use reusable cups for all store visits, whether it's a counter, drive-thru or mobile order by the end of this year. The coffee chain uses an estimated 7 billion disposable cups every year, comprising roughly 40% of the company's packaging waste. Starbucks has experimented with reusable cup concepts in markets around the world, including a "Borrow A Cup" program in Taiwan and a returnable cup program in cities including London, Geneva, and Paris. However, the company has a history of falling short of sustainability goals by proposed timelines.