Starbucks Corp. said March 20 that it will trial the use of "greener" cups and roll out strawless lids in select markets worldwide as part of the company's sustainability efforts.

The coffee chain will trial cups developed by the winners of its NextGen Cup Challenge at Starbucks stores in Seattle, New York, San Francisco, London and Vancouver, British Columbia. The NextGen initiative was aimed at identifying cup technologies that can be both recyclable and compostable on a global scale, the company said.

In addition, Starbucks will begin using recyclable, strawless lids in Los Angeles, San Francisco, Seattle, Washington, D.C., Indianapolis and Toronto this summer, as part of its commitment to eliminate over 1 billion straws a year.

The rest of its stores in the U.S. and Canada will roll out the strawless lids by early 2020, according to the release.

Starbucks also said that it will soon introduce a coffee traceability feature on its mobile app in an effort to let more customers understand where its coffee comes from.