Chlorophyll, perhaps?

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Across
  1. 4. Capital of the 'Emerald Isle'
  2. 8. Green Bay Packers fans
  3. 9. Band that released "Green is the Colour" in 1969 (4,5)
  4. 14. Herbal liqueur and mountain range in France
  5. 15. "_____ Green is made out of people!"
  6. 19. Bluegrass State
  7. 21. Sentient 1963 Volkswagen Beetle, Herbie the _______ (4,3)
  8. 25. Green onion in American English
  9. 27. Mario's brother
  10. 30. Explosive Minecraft mob
  11. 32. Does not like green eggs and ham (3,1,2)
  12. 34. Slang for a dollar bill
  13. 35. Squidward's archnemesis from high school band class, _____ Fancyson
  14. 40. He who stole Christmas
  15. 42. Rodian bounty hunter
  16. 44. French actress who played Artemisia in 300: Rise of an Empire, __ Green
  17. 45. Moss piglet
  18. 46. Green Day's third studio album, released in 1994
  19. 50. Tom Green's ex-wife; no longer hosting the 2023 National Book Awards due to her decision to air her talkshow during the WGA strikes
  20. 51. National symbol of Wales
  21. 52. Crash Course co-founder and brother of author John Green
  22. 53. Postman Pat's hometown
  23. 58. Lead single off Weezer's 2001 Green Album (4,4)
  24. 59. The Green Brigade is an ultra group supporting which Scottish football club
  25. 60. Golden State Warriors power forward, _____ Green
  26. 62. Highly venomous African snake, the green ____
  27. 63. The United States Army Special Forces are colloquially known as the Green ____
  28. 65. VeggieTales cucumber
  29. 66. Sang "It's Not Easy Being Green"
  30. 67. Japanese pinball machine game
Down
  1. 1. Fashion model daughter of Gwyneth Paltrow and Chris Martin
  2. 2. Billiards table fabric
  3. 3. Village in the Lake District home to poet William Wordsworth
  4. 4. Green line on the London Underground
  5. 5. Capital of Greenland
  6. 6. Forest moon home to the Ewoks
  7. 7. Argentinian condiment made of chopped parsley
  8. 10. Drag queen known for playing Plankton in the UK tour of the Spongebob Squarepants musical, ____ de Campo
  9. 11. South African-English actor known for playing Sherlock Holmes, ____ Rathbone
  10. 12. BBC daytime cooking show that pitted Red Tomato against Green Pepper (5,6,4)
  11. 13. Creedence Clearwater Revival vocalist who wrote and performed "Green River", John ____
  12. 16. A thing intended to conceal a difficulty or embarrassment
  13. 17. 55th wedding anniversary
  14. 18. 1967 Opel Kadett featured in the 2007 Top Gear Botswana special
  15. 20. Green Book (2019) star ______ Ali
  16. 22. Scottish city, name meaning "green hollow" in Gaelic
  17. 23. Also known as Baby Yoda
  18. 24. Former Fox News host enraged by "less sexy" redesign of the green M&M (6,7)
  19. 26. A Springbokkie shot is composed of crème de menthe and ____
  20. 28. Spineless cactus with psychedelic properties
  21. 29. First generation grass type Pokémon
  22. 31. The "Singapore of Africa", known for eco-tourism and gorilla-trekking
  23. 33. Famed soul and R&B singer, __ Green
  24. 36. New Zealand popstar who sang "Green Light"
  25. 37. "Collard Greens" rapper, ______ Q
  26. 38. Genre of dance music that grew out of the UK rave scene in the 1990s
  27. 39. Publisher of academic journals, also an aromatic herb
  28. 41. Desert plant used to make tequila
  29. 43. Cartoon frog meme co-opted by the alt-right
  30. 47. 2015 thriller starring Patrick Stewart and Anton Yelchin (5,4)
  31. 48. Cabbages, cauliflowers, Brussels sprouts and broccoli are all examples of
  32. 49. Beverage prepared with green tea powder
  33. 54. The UK's first elected Green Party MP, Caroline ____
  34. 55. Japanese horseradish
  35. 56. In snooker the green ball is worth how many points?
  36. 57. Home of the Royal Mint
  37. 61. South African word for cannabis
  38. 64. Plum cultivar used in jellies and jams
  39. 68. Tree featured on the national flag of Lebanon