A scientist’s position within the ranking is determined by their D-index (Discipline H-index), a metric that isolates and measures a researcher’s impact exclusively within the examined discipline—in this case, Environmental Sciences. This ensures that only publications and citations relevant to the specific field are considered, thereby reflecting specialized scholarly influence.
Scope of Research and Inclusion Criteria
The ranking was compiled by examining 279,971 scientist profiles drawn from a diverse set of bibliometric data sources across all disciplines. Specifically, 8 scientists were identified within the Environmental Sciences domain. To qualify for inclusion in this ranking, a scientist’s D-index had to meet a minimum threshold of 30, and the majority of their tier publications needed to be focused on Environmental Sciences.
Furthermore, a researcher’s awards and professional achievements within Environmental Sciences were also evaluated as supplementary indicators of leadership and excellence in the field. The D-index threshold for top researchers is calibrated as increments of 10 according to the total estimated number of scholars in each discipline. This approach not only maintains rigorous standards but also ensures that the top 1% of leading scholars are consistently incorporated into the list.
It was further required that there be a proximity of 30% or less between a scientist’s general H-index and their D-index to confirm their focused expertise within Environmental Sciences, thus filtering out those whose impact is more broadly dispersed across multiple disciplines.
Verification and Validation Practices
Recognizing that raw bibliometric data alone cannot serve as an absolute measure for evaluating scholarly output, the researchers behind this ranking undertook meticulous manual verification of all scientist profiles. Each profile was cross-referenced with publications from a wide range of trustworthy sources to ensure accuracy and relevance.
While the number of papers published in prominent journals and conferences is not a direct factor influencing the ranking position, it serves as a valuable secondary indicator of a scientist’s contribution to their specific scientific domain.
Ultimately, the ranking order is established using each scientist’s D-index derived from data collected via OpenAlex and CrossRef—two of the most prominent and well-regarded bibliometric databases available to the global research community.
For a detailed overview of the methodology employed, interested readers are encouraged to visit our methodology page.
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By doing so, we seek to foster collaboration, support informed decision-making, and accelerate the progress of science globally by acknowledging and disseminating knowledge of outstanding scholarly contributions.
