Podcast #46: Astronaut Chris Hadfield bows out, Why we should eat more insects + Our vocal ancestors

This podcast includes the following stories:

1. Astronaut Chris Hadfield returns to Earth a celebrity
2. Timetable agreed for ending EU fish discards
3. Eat insects, says UN
4. Top picks in environmental news
5. Peugeot pioneers air-powered car
6. Report: 97% of scientists agree on man-made global warming
7. Baboons reveal clues about our vocal ancestors 

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