Peer review is the driving force of journal development, and reviewers are gatekeepers who ensure that Clean Technologies maintains its standards for the high quality of its published papers. Thanks to the cooperation of our reviewers, in 2020, the median time to first decision was 17.5 days and the median time to publication was 53 days. The editors would like to express their sincere gratitude to the following reviewers for their precious time and dedication, regardless of whether the papers were finally published:
| Afenyo, Mawuli | Manzano-Agugliaro, Francisco |
| Alcaso, Adérito Neto | Marchev, Andrey |
| Amanowicz, Łukasz | Mariana, Iorgulescu |
| An, Feifei | Martínez-Márquez, Camilo I. |
| Andrianasolo, Eric | Martino, Marco |
| Aspegren, Henrik | Masłoń, Adam |
| Astolfi, Davide | Matsuyama, Hideto |
| Attia, Shady | Mayyahi, Ahmed Al |
| Bagalkot, Nikhil | Medyńska-Juraszek, Agnieszka |
| Barwicki, Jan | Meng, Zheng |
| Baur, Stuart | Miccio, Francesco |
| Bennamoun, Lyes | Mikołajczyk, Tomasz |
| Bernal-Perez, Soledad | Minciuc, Eduard |
| Beszédes, Sándor | Mohelnikova, Jitka |
| Brito, Paulo | Moliner, Cristina |
| Brunklaus, Gunther | Muro, Aldo |
| Cablé, Axel | Mutlu, Mete |
| Cecconet, Daniele | Nag, Soumyadeep |
| Ceran, Bartosz | Naser, M. Z. |
| Cespi, Daniele | Nawarathna, Thiloththama Hiranya Kumari |
| Chan, Fan Liang | Netskina, Olga |
| Charvátová, Hana | Nikolovski, Srete |
| Chen, Daiqin | Nizetic, Sandro |
| Chioncel, Cristian Paul | Ogliari, Emanuele |
| Cho, In Sun | Oryani, Bahareh |
| Cinelli, Patrizia | Ostadhassan, Mehdi |
| Craciunescu, Aurelian | Pană, Adrian |
| Cuerdo Vilches, María Teresa | Panepinto, Deborah |
| D’Adamo, Idiano | Paul, Suvash Chandra |
| Di Fazio, Anna Rita | Pawlak, Andrzej |
| Dipu, Arnoldus Lambertus | Perea-Moreno, Miguel-Angel |
| Dzida, Marzena | Pereira, Leonel |
| El-Sayed, Marwa | Pérez-Collazo, Carlos |
| Eszter, Hubainé Tóth | Pham, Hong Duc |
| Ferrantelli, Andrea | Porowski, Adam |
| Flores, Robert J. | Proszak-Miąsik, Danuta |
| García-gracia, Miguel | Putta, Koteswara Rao |
| Gil-Garcia, Isabel Cristina | Raston, Colin L |
| Girolami, Flavia | Redel-Macías, María Dolores |
| Goit, Jay Prakash | Remón, Javier |
| Gómez-Soberón, Jose Manuel | Rodgers, Marianne |
| Gullo, Paride | Sagnelli, Domenico |
| Hammad, Ahmed | Salerno, Carlo |
| Heift, Dominikus | Sassanelli, Claudio |
| Helmi, Arash | Schirp, Arne |
| Honrubia-Escribano, Andres | Schmidt, Jonas |
| Howell, Bob | Shandro, Janis |
| Hu, Guoping | Shao, Jiankun |
| Hybská, Helena | Simões, Nádia |
| Ichinose, Toshiaki | Șoimoșan, Teodora Melania |
| Ihara, Takeshi | Sousa, Cristina |
| Ionescu, Laurentiu Mihai | SSennoga, Twaha |
| Irshad, Ahamed | Staszewski, Łukasz |
| Isaev, Abdulgalim | Stechel, Ellen |
| Jindrichovska, Irena | Stegenta-Dąbrowska, Sylwia |
| Kang, Seongmin | Teixeira, Carlos |
| Kapica, Jacek | Theristis, Marios |
| Kara De Maeijer, Patricia | Tomczewski, Andrzej |
| Karvelas, Evangelos | Țoniș Bucea-Manea, Rocsana |
| Kasperski, Andrzej | Topor, Marcel |
| Katioglu-Yazan, Tugce | Urbanik, Marek |
| Khalili, Nasrin R. | Vakalis, Stergios |
| Kim, Man-Hoe | Van Duijsen, Peter |
| Kishore, Ravi Anant | Vaverková, Magdalena Daria |
| Kotter, Richard | Viguri, Javier R. |
| Kučera, Marián | Vojtisek-Lom, Michal |
| Kura, Branislav | Vollprecht, Daniel |
| Lau, Anthony | Vuppala, Srikanth |
| Liao, Chien-Sen | Weng, Guo-Ming |
| Liu, Qili | Wolny, Lidia |
| Loganathan, Bommanna G. | Yoshida, Shigeo |
| Luck, Rudy | Yu, Xi |
| Lykidis, Charalampos | Zhou, Xiaochi (Joe) |
| Manta, Otilia |
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