We'd love to hear your thoughts on the podcast. Take the survey here or at wbur.org/survey. Astrid Puentes Riaño won a landmark case in Peru on behalf of families sickened by pollution. Now, she's defending everyone's right to a healthy environment as the United Nations' new special rapporteur for human rights and environment. And, archaeologists in Wisconsin discovered 11 canoes that Indigenous people made. One of them is 4,500 years old. Wisconsin State archaeologist Amy Rosebrough joins us. Then, artificial intelligence is helping researchers track whales and dolphins. Ted Cheeseman, founder of Happy Whale, talks with us about how he identifies individual whales.

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