A scientist's position in the ranking is determined by their D-index (Discipline H-index), a specialized citation-based metric that considers only those papers and citation counts directly relevant to the examined discipline—in this case, Environmental Sciences. The D-index ensures that the ranking reflects a researcher’s specialized influence within their field, rather than their broader academic footprint.
Scope of Research and Inclusion Criteria
The ranking process examined a total of 279,971 scientist profiles identified across all academic disciplines from an extensive array of bibliometric sources. Specifically, within the discipline of Environmental Sciences, 1,000 scientists were analyzed to compile the final list.
To qualify for inclusion in the ranking, researchers needed to satisfy several stringent criteria:
- A D-index of at least 30 within the Environmental Sciences discipline.
- A majority of their top-tier publications must specifically belong to Environmental Sciences.
- Recognition of awards and notable achievements within the field of Environmental Sciences was also factored in as a qualitative measure.
The D-index threshold for considering top researchers varies incrementally by 10 points, depending on the estimated total number of scholars in the discipline, while ensuring that the top 1% of leading experts are systematically incorporated into the ranking. Additionally, the methodology mandates that the difference between a scientist’s general H-index and their D-index not exceed 30%, preserving alignment between their overall academic standing and discipline-specific impact.
Verification and Quality Assurance Practices
Understanding the limitations of raw bibliometric data, the researchers responsible for this ranking undertook extensive manual verification of all scientist profiles. This included cross-correlation of identified publications with a broad spectrum of trustworthy sources to verify accuracy and reliability.
Although the number of papers published in prominent journals and conference proceedings does not directly influence a researcher’s position in the Research.com ranking, it constitutes a valuable secondary signal of their scholarly contributions and standing within Environmental Sciences.
The ranking position is established using each scientist’s D-index calculated from verified data primarily drawn from OpenAlex and CrossRef, regarded as the most prominent and reliable bibliometric databases available to the global research community.
For a comprehensive overview of the methodology employed, readers are encouraged to visit our methodology page.
Research.com’s Mission and Commitment
Research.com’s overarching mission in the creation of this ranking is to motivate researchers, companies, and policymakers worldwide to explore where leading experts in Environmental Sciences and other disciplines are directing their efforts. By providing a transparent and dependable platform, we enable the global scientific community to identify and connect with top scholars at the country level, within specific research areas, or even across institutions.
Through meticulous data collection, rigorous validation, and a commitment to academic integrity, we strive to build trust and credibility in our rankings as valuable resources for supporting research advancement, strategic collaboration, and informed decision-making.
