According to Arcadis' 2018 Sustainability Index, Sydney ranks 34th in the world for sustainability, and first in Australia. 

Rankings are based on the three pillars of sustainability: people, planet and profit. These pillars are closely aligned to the UN Sustainable Development Goals.

London tops the rankings, followed by Stockholm, Edinburgh, Singapore and Vienna. Overall, European cities dominate the list of the most sustainable cities. 

Australian cities all scored "middle of the road" on the index, according to Arcadis. All Australian cities performed well on people-focused measures, scoring well in health, education and digital enablement, moderately well in the profit pillar due to employment and ease of doing business, but all scored worse in the planet pillar, with greenhouse gas emissions and waste management common issues across all four cities.  

"With no Australian city cracking the top 30 and one in the bottom 50, it's confirmation that we need to continue to focus on improving the long-term sustainability, resilience and performance of our cities to acts on the global stage," says Stephen Taylor, Australian cities director, Arcadis.

"Across our cities, particularly in Sydney and Melbourne, we've seen a real shift over the last few years beyond green sustainability to social sustainability. Both government and private developments are increasingly focusing on how projects can better improve communities, including financial gains and community wellness. 

"Despite the middle of the road rankings, the nation's strong focus on developing integrated transit systems, addressing affordability and embracing sustainability in construction are all positive signs for future improvement across the three pillars

Full 2018 Sustainable Cities Index rankings: 

  1. London
  2. Stockholm
  3. Edinburgh
  4. Singapore
  5. Vienna
  6. Zurich
  7. Munich
  8. Oslo
  9. Hong Kong
  10. Frankfurt
  11. Copenhagen
  12. Amsterdam
  13. Seoul
  14. New York
  15. Paris
  16. San Francisco
  17. Hamburg
  18. Berlin
  19. Seattle
  20. Dublin
  21. Madrid
  22. Boston
  23. Prague
  24. Taipei
  25. Ottawa
  26. Vancouver
  27. Rotterdam
  28. Barcelona
  29. Manchester
  30. Toronto
  31. Montreal
  32. Glasgow
  33. Tokyo
  34. Sydney
  35. Canberra
  36. Geneva
  37. Calgary
  38. Birmingham
  39. Washington
  40. Rome
  41. Macau
  42. Milan
  43. Antwerp
  44. Brisbane
  45. Los Angeles
  46. Lyon
  47. Brussels
  48. Chicago
  49. Wellington
  50. Leeds 
  51. Houston
  52. Philadelphia
  53. Denver
  54. Warsaw
  55. Honolulu
  56. Melbourne
  57. Budapest
  58. Moscow
  59. Dallas
  60. Pittsburgh
  61. New Orleans
  62. Lisbon
  63. Miami
  64. Indianapolis
  65. Jacksonville
  66. Shenzhen
  67. Kuala Lumpur
  68. Baltimore
  69. Phoenix
  70. Atlanta
  71. Detroit
  72. Tampa
  73. Beijing
  74. Guangzhou
  75. Athens
  76. Shanghai
  77. Santiago
  78. Sao Paulo
  79. Mexico City
  80. Bangkok
  81. Buenos Ares
  82. Istanbul
  83. Tianjin
  84. Rio de Janeiro
  85. Lima
  86. Salvador
  87. Wuhan
  88. Chennai
  89. New Delhi
  90. Chengdu
  91. Bengaluru
  92. Johannesburg
  93. Mumbai
  94. Jakarta
  95. Manilla
  96. Nairobi
  97. Cape Town
  98. Hanoi
  99. Cairo
  100. Kolkata