Positions within the ranking are determined by the aggregate D-indexes (Discipline H-index) of all affiliated scholars at each institution, where the scholars’ predominant publication area is Environmental Sciences. The D-index is a refined metric, exclusively representing publications and citation data within the examined discipline, ensuring the evaluation is tightly aligned with the specific research context.
Scope and Evaluation Criteria
To establish a rigorous and representative ranking, Research.com systematically reviewed 279,971 scientist profiles sourced from diverse bibliometric databases. Of these, 17,263 scientists were identified and analyzed as specialists in Environmental Sciences. To qualify for consideration, each scientist needed a minimum D-index of 30, and their primary body of work had to be in Environmental Sciences. The D-index threshold for top researchers was dynamically set with 10-point increments, dependent on the overall number of scholars in each discipline, while ensuring the top 1% of leading scholars were included.
Additionally, the methodology requires that there be a proximity of 30% or less between a scientist’s overall H-index and their D-index, thereby emphasizing truly field-specific contributions. Beyond quantitative metrics, qualitative measures such as a scientist’s awards and achievements within Environmental Sciences were also factored into the evaluation process.
Additional Verification Practices
Recognizing the limitations of raw bibliometric data, Research.com implemented robust manual verification procedures. Each scientist profile underwent careful manual review and cross-referencing with a wide range of reputable publication sources. While the count of publications in high-impact journals and conferences does not directly influence ranking position, it is acknowledged as a valuable indicator of scholarly activity within Environmental Sciences.
The final ranking leverages each researcher’s H-index, as compiled from OpenAlex and CrossRef, which are recognized as the foremost bibliometric databases within the global research community. This multi-layered approach ensures a balance between quantitative rigor and qualitative discernment. Interested readers can explore further details about the evaluation process on our methodology page.
Research.com’s Mission and Agenda
Research.com is dedicated to empowering scientists, business leaders, and policymakers worldwide by illuminating the trajectory of leading experts in various scientific domains. By making transparent and accessible the identification of top experts—whether across disciplines, nations, or within individual research institutions—our mission is to foster a deeper understanding of where pioneering research is occurring, encourage international collaboration, and inspire future scientific advancement.
Key Results of the 2024 Environmental Sciences University Ranking in New Zealand
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Top 3 institutions with the highest number of leading scientists in Environmental Sciences:
- Victoria University of Wellington (6 scientists)
- Massey University (5 scientists)
- University of Waikato (4 scientists)
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The most prominent scholars in Environmental Sciences globally represent premier institutions, including: California Institute of Technology, Harvard University, Rice University, University of Almería, University of Helsinki, Korea University, University of East Anglia, University at Albany – State University of New York, Pennsylvania State University, University of Colorado Boulder.
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Top individual scholars worldwide:
- Professor P. Ciais (French Alternative Energies and Atomic Energy Commission, CEA): D-index of 207 (Rank 1)
- John H. Seinfeld (California Institute of Technology): D-index of 194 (Rank 2)
- Daniel J. Jacob (Harvard University): D-index of 191 (Rank 3)
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Statistical insights:
- Average total D-index for the top 5% universities: 2,061
- Average total D-index for all 1,001 institutions included: 318
- Average number of published articles by scientists at top 5% of universities: 7,534
- Average number of published articles for all 1,001 universities: 1,185
- Average citations among researchers at top 1% universities: 279,971
- Average citations among researchers at all 1,001 universities: 83,066
These results underscore the rigorous approach and integrity of the Research.com ranking, designed to provide valuable benchmarking tools for academic institutions and the broader scientific community. The 2024 edition not only highlights excellence in New Zealand’s Environmental Sciences landscape, but also places national achievements within the context of a global disciplinary benchmark.
