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Across 4. City that plans to remove all parking spaces 7. Location of the world's largest tropical rainforest 9. City which contains 2% of the world's species (2 Words) 11. City where Greenpeace was founded 13. Birthplace of the environmental activist Greta Thunberg 14. Country with the greatest population of African elephants 17. Location of Serengeti National Park 18. Home of the endangered red squirrel 20. World's coldest country 21. Country which uses the highest percentage of renewable power 22. World's hottest country 23. Country with the greatest population of wild tigers

Down 1. Country with a bottle deposit scheme that collects 97% of its bottles 2. Country with greatest number of bird species 3. Asian citystate with a 40% vegetation cover 5. City that will ban all polluting vehicles from 2030 onwards 6. Location of the world's largest coral reef 7. Location of the 'turtle spa' seen in the documentary 'Blue Planet II' 8. American state most at risk of flooding due to rising sea levels 10. Home of the endangered snow leopard and giant panda 12. World's lowest-lying nation 15. Country with the greatest population of polar bears 16. UK city which introduced the 'Boris bike' scheme 19. Location of Nairobi National Park