25. Why could urbanization save biodiversity? (Eric Sanderson)

24. Can GMOs benefit biodiversity? (Joseph Opoku Gakpo)

23. How alarmed should we be about the environment? (Matt Ridley)

22. Trophy hunting: Who's to judge? (Lochran Traill)

21. How can we better understand environmental change? (Timm Hoffman)

20. Is renewable energy better for biodiversity? (Alexandros Gasparatos)

19. Is aquaculture good or bad for the environment? (Roz Naylor)

18. Can we balance people's and nature's water needs? (Jenny Day)

17. Are we conserving for the right reasons? (Sharachchandra Lele)

16. How do we cultivate enthusiasm for nature? (Steven Lowe)