AstraZeneca has made several news headlines for its environmental sustainability pledges, including deals for renewable natural gas and a commitment to plant hundreds of millions of trees.

In this episode of "The Top Line," Fierce Pharma's Eric Sagonowksy talks with Pam Cheng, the AstraZeneca executive who is playing a key role in driving the company's sustainability ambitions.

To learn more about the topics in this episode: 

• Fellowship of the green: AstraZeneca, Samsung, GSK and more unite to slash greenhouse gas emissions

• AstraZeneca sows $400M investment in push to plant 200M trees by 2030

• From farm to pharma: AstraZeneca inks renewable natural gas pact to shrink environmental footprint

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