Citation Rankings
Highly Cited Researchers
Africa Engineering & Technology / Environmental Science & Engineering Highly Cited Researchers Citation Rankings 2025
The Citation Rankings (Highly Cited Researchers) highlight the most cited and influential researchers across a vast range of scientific fields, covering 197 main and sub-disciplines, including the Art and Humanities Citation Rankings and Social Sciences and Humanities Citation Rankings. This service, offered exclusively by AD Scientific Index, aims to provide a balanced perspective by excluding data from CERN and other statistical sources that disproportionately favor certain researchers, particularly in the social sciences and humanities. This unique approach addresses the advantages researchers with multi-author publications and CERN involvement hold over others. Furthermore, citation rankings help uncover rule violations and unethical practices within the research community. For more detailed citation analyses, explore the Scientists Last 6 Years Citation Index, Universities Total Citations Rankings 2025, and Universities Last 6 Years Citations Rankings 2025.
* Total Citation Counts Rankings
Ranking Based On Selection: 1
Climate Change
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
45,858
18,251
0.398
* Total Citation Counts Rankings
Ranking Based On Selection: 2
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
23,833
11,807
0.495
* Total Citation Counts Rankings
Ranking Based On Selection: 3
Wastewater Technology
Algal Biotechnology
Biofuels
Bioremediation
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
18,344
12,587
0.686
* Total Citation Counts Rankings
Ranking Based On Selection: 4
enviornmental science
enviornmental biology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
17,882
9,458
0.529
* Total Citation Counts Rankings
Ranking Based On Selection: 5
Environmental Health
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
17,438
9,808
0.562
* Total Citation Counts Rankings
Ranking Based On Selection: 6
Environmental Engineerning
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
16,170
5,000
0.309
* Total Citation Counts Rankings
Ranking Based On Selection: 7
Wastewater treatment technologies
Bioreactors
Membrane technology
Water reuse
Microbial fuel
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,795
7,729
0.489
* Total Citation Counts Rankings
Ranking Based On Selection: 8
Environmental Science and Technology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,582
14,979
0.961
* Total Citation Counts Rankings
Ranking Based On Selection: 9
Climate change
sustainability
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,059
5,654
0.375
* Total Citation Counts Rankings
Ranking Based On Selection: 10
climate change mitigation
poverty
global stocktake
policy analysis
sustainable development
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
14,960
9,056
0.605
* Total Citation Counts Rankings
Ranking Based On Selection: 11
Exposome
Diet and Respiratory disease
Air pollution and Respiratory Health
and Climate and Health
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
14,901
13,190
0.885
* Total Citation Counts Rankings
Ranking Based On Selection: 12
climate change
risk
biodiversity
health
sustainability
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,569
12,221
0.972
* Total Citation Counts Rankings
Ranking Based On Selection: 13
vulnerability
adaptation
climate change
development
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,073
6,946
0.575
* Total Citation Counts Rankings
Ranking Based On Selection: 14
Climate Science
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,644
8,128
0.764
* Total Citation Counts Rankings
Ranking Based On Selection: 15
Environmental Science
Reproductive Toxicology
Endocrine Disruption
Hepatotoxicity
Drug Toxicity
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,589
3,913
0.370
* Total Citation Counts Rankings
Ranking Based On Selection: 16
Advanced Oxidation Processes
Ozone
UV
Electrolysis
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,906
3,484
0.352
* Total Citation Counts Rankings
Ranking Based On Selection: 17
Climate Change
Livestock Systems
Pastoralism
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,093
4,804
0.528
* Total Citation Counts Rankings
Ranking Based On Selection: 18
sustainability engineering
biogas
LCA
Future Technologies
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,808
6,968
0.791
* Total Citation Counts Rankings
Ranking Based On Selection: 19
Adsorption
Water treatment
nanotechnology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,375
4,612
0.551
* Total Citation Counts Rankings
Ranking Based On Selection: 20
High Voltage Engineering
Lightning
EMI/EMC
Environmental Science
Extreme Natural Events
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,307
5,750
0.692
* Total Citation Counts Rankings
Ranking Based On Selection: 21
climate
ecosystems
sustainable agriculture
Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,986
5,417
0.678
* Total Citation Counts Rankings
Ranking Based On Selection: 22
Water quality management
Applied GIS for Water quality managementENVIRONMENTAL MANAGEMENT
ENVIRONMENTAL SANITATION
ENVIRONMEN
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,618
7,588
0.996
* Total Citation Counts Rankings
Ranking Based On Selection: 23
Génie de l'Environnement
Génie des Procédés
Chimie de l'Environnement
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,591
3,599
0.474
* Total Citation Counts Rankings
Ranking Based On Selection: 24
Algal Biofuels
Biotechnology
Nutrient recovery
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,343
4,658
0.634
* Total Citation Counts Rankings
Ranking Based On Selection: 25
Environmental Engineering
Water Treatment
Desalination
Circular Economy
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,642
4,942
0.744
* Total Citation Counts Rankings
Rankings
11,428
33
14
Ranking Based On Selection: 1
Mark New
University of Cape Town
Cape Town, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
45,858
18,251
0.398
* Total Citation Counts Rankings
Rankings
31,680
98
2
Ranking Based On Selection: 2
Charlie Shackleton
Rhodes University
Grahamstown, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
23,833
11,807
0.495
* Total Citation Counts Rankings
Rankings
45,600
147
1
Ranking Based On Selection: 3
Faizal Bux
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
18,344
12,587
0.686
Wastewater Technology
Algal Biotechnology
Biofuels
Bioremediation
* Total Citation Counts Rankings
Rankings
47,268
41
8
Ranking Based On Selection: 4
Mazharuddin Khan
Addis Ababa University
Addis Ababa, Ethiopia
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
17,882
9,458
0.529
enviornmental science
enviornmental biology
* Total Citation Counts Rankings
Rankings
48,912
12
1
Ranking Based On Selection: 5
Wilkister Nyaora Moturi
Egerton University
Njoro, Kenya
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
17,438
9,808
0.562
* Total Citation Counts Rankings
Rankings
54,105
180
37
Ranking Based On Selection: 6
George Ekama
University of Cape Town
Cape Town, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
16,170
5,000
0.309
Environmental Engineerning
* Total Citation Counts Rankings
Rankings
55,837
187
3
Ranking Based On Selection: 7
Ali Akbar Zinatizadeh
University of South Africa
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,795
7,729
0.489
Wastewater treatment technologies
Bioreactors
Membrane technology
Water reuse
Microbial fuel
* Total Citation Counts Rankings
Rankings
56,817
52
11
Ranking Based On Selection: 8
Adhena Ayaliew Werkneh
Mekelle University
Mekelle, Ethiopia
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,582
14,979
0.961
Environmental Science and Technology
* Total Citation Counts Rankings
Rankings
59,483
198
15
Ranking Based On Selection: 9
Barend Erasmus
University of Pretoria
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
15,059
5,654
0.375
Climate change
sustainability
* Total Citation Counts Rankings
Rankings
60,020
202
40
Ranking Based On Selection: 10
Harald Winkler
University of Cape Town
Cape Town, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
14,960
9,056
0.605
climate change mitigation
poverty
global stocktake
policy analysis
sustainable development
* Total Citation Counts Rankings
Rankings
60,273
54
12
Ranking Based On Selection: 11
Mulubirhan Assefa Alemayohu
Mekelle University
Mekelle, Ethiopia
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
14,901
13,190
0.885
Exposome
Diet and Respiratory disease
Air pollution and Respiratory Health
and Climate and Health
* Total Citation Counts Rankings
Rankings
75,061
251
51
Ranking Based On Selection: 12
Christopher Trisos
University of Cape Town
Cape Town, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,569
12,221
0.972
climate change
risk
biodiversity
health
sustainability
* Total Citation Counts Rankings
Rankings
78,761
267
56
Ranking Based On Selection: 13
Gina Ziervogel
University of Cape Town
Cape Town, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
12,073
6,946
0.575
vulnerability
adaptation
climate change
development
* Total Citation Counts Rankings
Rankings
91,679
317
74
Ranking Based On Selection: 14
Christopher Lennard
University of Cape Town
Cape Town, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,644
8,128
0.764
* Total Citation Counts Rankings
Rankings
92,253
126
10
Ranking Based On Selection: 15
Mokhtar Ibrahim Yousef
Alexandria University
Alexandria, Egypt
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,589
3,913
0.370
Environmental Science
Reproductive Toxicology
Endocrine Disruption
Hepatotoxicity
Drug Toxicity
* Total Citation Counts Rankings
Rankings
99,564
74
17
Ranking Based On Selection: 16
Joon Wun Kang
Addis Ababa University
Addis Ababa, Ethiopia
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,906
3,484
0.352
Advanced Oxidation Processes
Ozone
UV
Electrolysis
* Total Citation Counts Rankings
Rankings
109,757
29
4
Ranking Based On Selection: 17
Polly Ericksen
International Livestock Research Institute (ILRI)
Addis Ababa, Kenya
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
9,093
4,804
0.528
Climate Change
Livestock Systems
Pastoralism
* Total Citation Counts Rankings
Rankings
113,809
420
17
Ranking Based On Selection: 18
Charles Mbohwa
University of Johannesburg
Johannesburg, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,808
6,968
0.791
sustainability engineering
biogas
LCA
Future Technologies
* Total Citation Counts Rankings
Rankings
120,476
449
6
Ranking Based On Selection: 19
Maurice S. Onyango
Tshwane University of Technology
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,375
4,612
0.551
Adsorption
Water treatment
nanotechnology
* Total Citation Counts Rankings
Rankings
121,560
453
59
Ranking Based On Selection: 20
Chandima Gomes
University of the Witwatersrand
Johannesburg, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
8,307
5,750
0.692
High Voltage Engineering
Lightning
EMI/EMC
Environmental Science
Extreme Natural Events
* Total Citation Counts Rankings
Rankings
126,912
475
41
Ranking Based On Selection: 21
Emma Archer
University of Pretoria
Pretoria, South Africa
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,986
5,417
0.678
climate
ecosystems
sustainable agriculture
Africa
* Total Citation Counts Rankings
Rankings
133,674
70
3
Ranking Based On Selection: 22
Osayomwanbo Osarenotor
University of Benin
Benin City, Nigeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,618
7,588
0.996
Water quality management
Applied GIS for Water quality managementENVIRONMENTAL MANAGEMENT
ENVIRONMENTAL SANITATION
ENVIRONMEN
* Total Citation Counts Rankings
Rankings
134,177
24
1
Ranking Based On Selection: 23
Hakim Lounici
Université de Bouira
Bouïra, Algeria
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,591
3,599
0.474
Génie de l'Environnement
Génie des Procédés
Chimie de l'Environnement
* Total Citation Counts Rankings
Rankings
139,102
547
8
Ranking Based On Selection: 24
Ismail Rawat
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
7,343
4,658
0.634
Algal Biofuels
Biotechnology
Nutrient recovery
* Total Citation Counts Rankings
Rankings
154,500
40
7
Ranking Based On Selection: 25
Mohamed Chaker Ncibi
Mohammed VI Polytechnic University
Ben Guerir, Morocco
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
6,642
4,942
0.744
Environmental Engineering
Water Treatment
Desalination
Circular Economy