Seattle

STARBUCKS Corp is trying out the buy-one, give-one model embraced by startups such as Toms Shoes and Warby Parker.

Beginning Sept 29, the chain will donate a coffee tree to farmers for every bag of coffee beans that customers buy from its 7,400 US company-owned locations. The year-long programme is part of an effort to raise awareness about the rust fungus that's damaging crops in Central America.