[8][9] Alice Li replaced Laura Pastor, Miss Earth Canada 2021, as she said that she would fit better in a live pageant than virtual one.

[10] Anastasia Almyasheva replaced Miss Earth Russia Albina Koroleva who withdrew for undisclosed reasons.

[11] The 2021 edition saw the debuts of Gambia,[12] Iran, and Laos, and the return of Angola, Belize, Botswana, Bulgaria, Crimea, Cuba, the Czech Republic, England, Kyrgyzstan, Latvia, Malaysia, Nepal, North Macedonia, Rwanda, and Ukraine.

Burkina Faso, Costa Rica, Ecuador, Finland, Germany, Guyana, Iceland, Jamaica, Moldova, Mongolia, Pakistan, Poland, Romania, Sierra Leone, Uruguay, the United States Virgin Islands, and Zambia withdrew after their respective organizations failed to hold a national competition or appoint a delegate.

They were Lune Aminata Coulibaly of Côte d'Ivoire, Ana Brajčić of Croatia, Tamnica Kedir Zeynu of Ethiopia, Jissel Rivera of Honduras, Sima Mohamed of Iraq, Odella Flomo of Liberia, Miriam Abdou Saleye of Niger, Jelena Vukcevic of Switzerland, and Chilekwa Kalunga of Zambia.