Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Earth was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 18 days, and the median time to publication was 45 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Acharya, Tri Dev | Li, Zhi |
| Alves, Elis | Li, Zhongju |
| Azman, Lucija | Lipchin, Clive |
| Bathrellos, George | Lobry De Bruyn, Lisa |
| Bauer, Sonja | López Jiménez, Petra Amparo |
| Bellows, Barbara | Lowe, David J. |
| Bethurem, Matthew | Ma, Yaoming |
| Birau, Felicia Ramona | Macleod, Kit |
| Blanc, Jean-François | Mastbergen, Dick R. |
| Boanca, Paunita | Meiguins de Lima, Aline Maria |
| Boccia, Flavio | Meo, Mark |
| Bonakdari, Hossein | Moriche, Ángela Engelmo |
| Borowska-Stefańska, Marta | Muthama, John Nzioka |
| Bosson, Jean Baptiste | Myrgiotis, Vasileios |
| Byrne, Andrew | Nameni, Gordon |
| Calcan, Andreea | Nastis, Stefanos A. |
| Carter, Sarah | Nepeina, Kseniia |
| Carvalho, Daniel Fonseca | Nooni, Isaac |
| Chishtie, Farrukh | Oliver, Randy |
| Ciarlo, James | Oommen, Thomas |
| Cogato, Alessia | Otto, Antje |
| Dąbrowska, Dominika | Parella, Jordi Franch |
| De Boer, Dirk | Patarlageanu, Simona |
| De Luca, Giuseppe | Peiffer, Herman |
| Destefanis, Enrico | Perry, Jim |
| Di Stefano, Raffaele | Philippe, Petitjeans |
| D’Urso, Maria Grazia | Plater, Andy |
| Elfadaly, Abdelaziz | Polla, Silvia |
| Elvidge, Sean | Porfido, Sabina |
| Esfandiari, Masoud | Rabault, Jean |
| Faruolo, Mariapia | Rahman, Md Mofijur |
| Ferreira, Vitor | Raman, Aishwarya |
| Flaquer, Carles | Raulin, Jean-Pierre |
| Fonte, Joao | Romano, Pierdomenico |
| Garrido, Claudia | Ruiz, Cristián A. Ducoing |
| Gatzweiler, Franz | Russo, Giovanni |
| Georgieva, Tzveta | Santos, Catarina Jóia |
| Gerda, Kuiper | Šomplák, Radovan |
| Gong, Adu | Sottile, Francesco |
| González Del Tánago, Marta | Sousa, Ana L. |
| Gusarov, Artyom | Szymańska, Elżbieta |
| Hoogeveen, Dawn | Tara, Ata |
| Horvat, Bojana | Tarchiani, Vieri |
| Jasińska, Karolina D. | Tonyaloğlu, Ebru Ersoy |
| Jiang, Jianhua | Trestini, Samuele |
| Jung, Yoonhee | Upadhyay, Pawan |
| Kabala, Cezary | Van Den Born, Riyan |
| Kalenik, Marek | Vasenev, Ivan |
| Karasmanaki, Evangelia | Vlahos, Georgios |
| Kariuki, Rebecca | Wang, Jingxia |
| Kata, Ryszard | Wiesner, Susanne |
| Kim, Jonggun | Yakar, Murat |
| Komissarov, Mikhail | Yu, Ting-To |
| Kot, Sebastian | Zacepins, Aleksejs |
| Ladeira, Francisco Sergio Bernardes | Zanoletti, Alessandra |
| Lai, Jhe-Syuan | Zhao, Yongling |
| Lauriola, Paolo | Zhu, Junxiang |
| Lee, Jiyeong |
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