On this week's show we speak with Princeton University's Zuzana Burivalova about whether forest certification schemes like the Forest Stewardship Council (FSC) are actually achieving their environmental, social, and economic goals. Whether they do or not has massive implications for forest conservation worldwide, and while the evidence is hard to find, this tropical forest ecologist has interesting findings to share.

Our second guest is Steve Wilson, who has just written a new paper on Javan rhino vocalizations. He plays some recordings of these fascinating sounds and discusses what they mean. 

Plus we round up the past two weeks' top news.

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