A scientist’s position in the ranking is determined exclusively by their D-index (Discipline H-index), a refined bibliometric indicator that considers only the publications and citations linked specifically to the examined discipline—in this case, Environmental Sciences—thereby providing a focused and discipline-sensitive evaluation of scholarly impact.
Scope of Research and Ranking Criteria
The scope of this ranking encompasses 279,971 scientist profiles meticulously identified from a broad suite of bibliometric repositories across all scientific disciplines. Within the Environmental Sciences domain, a focused subset of 4 scientists was examined for inclusion. To qualify for the ranking, a scientist must achieve a D-index of at least 30, with a majority of their tier publications centered in Environmental Sciences.
In addition to bibliometric performance, scientists’ awards and achievements within the field were considered to provide a multidimensional perspective on their scholarly contributions. The threshold for the D-index is adjusted incrementally (in steps of 10) based on the total estimated number of scholars in each discipline, with the overriding goal of guaranteeing that the top 1% of leading researchers are represented in the list.
Moreover, a critical quality filter was applied to ensure the proximity between a researcher’s overall general H-index and their discipline-specific D-index remains at 30% or less, maintaining coherence between general impact and specialized expertise.
Verification Practices and Methodological Transparency
Recognizing the limitations inherent to raw bibliometric data, the team behind this ranking has implemented rigorous verification processes. Each scientist’s profile was subjected to manual review and cross-correlation against publications indexed in a wide array of trustworthy academic databases and sources. This additional scrutiny serves to enhance the accuracy and reliability of the ranking’s outcomes.
While not directly influencing a scientist’s ranking position, the quantity of publications appearing in prominent journals and conference proceedings is acknowledged as an important secondary indicator of a researcher’s contribution within their specialized field.
The ranking position is ultimately established on the basis of each scientist’s D-index, computed from information curated through OpenAlex and CrossRef—arguably the most prominent and transparent bibliometric databases accessible to the global research community.
We invite readers to gain a deeper understanding of the comprehensive methodology employed in creating this ranking by visiting our methodology page.
Research.com’s Mission and Vision
At Research.com, our mission is to stimulate curiosity and informed decision-making among researchers, companies, and policymakers worldwide by illuminating where the leading experts within each scientific discipline are directing their efforts. We provide an essential platform for the global scientific community to identify, recognize, and engage with the foremost authorities in specific research areas, across diverse countries, and within institutional settings.
Through diligent data collection, rigorous verification, and transparent dissemination, this ranking aspires to foster collaboration, inspire excellence, and catalyze innovation within the Environmental Sciences and beyond.
