Data Sources Utilized for the Ranking
The 5th edition of the Research.com Best Environmental Sciences Scientists in Qatar Ranking is founded on a robust and multi-faceted data collection process. Primary data sources include OpenAlex and CrossRef, two of the most prominent and comprehensive bibliometric databases available to the scientific community. These databases were supplemented by a range of additional reliable data repositories to enhance completeness and accuracy. Bibliometric data used to devise the citation-based metrics central to this ranking were collected on January 12, 2026. A scientist’s position in the ranking is determined exclusively by their D-index (Discipline H-index), a refined metric that considers only the researcher’s papers and citation performance within the specific discipline of Environmental Sciences.
Scope of Research and Ranking Criteria
This ranking examines a total of 279,971 scientist profiles drawn from multiple bibliometric data sources encompassing all scientific disciplines. Among these, 3 scientists specialized in Environmental Sciences were identified for assessment. To qualify for inclusion, a scientist must possess a D-index of at least 30, ensuring a high level of contribution within the discipline. Furthermore, the majority of tier publications attributed to a qualifying scientist are required to be focused within Environmental Sciences.
In addition to bibliometric criteria, awards and other recognized achievements within the Environmental Sciences field were also factored into the evaluation process. The threshold for the D-index is incremented by 10 depending on the estimated total number of scholars in each discipline. This approach guarantees representation of the top 1% of leading experts in the field. Additionally, a proximity criterion is applied whereby the difference between a scientist’s general H-index and their D-index must be 30% or less, ensuring a consistent disciplinary focus in the ranking.
Additional Verification and Methodological Rigor
The researchers involved in creating this ranking recognize that raw bibliometric data alone cannot fully capture the breadth and quality of scholarly output. Accordingly, every scientist profile was subjected to manual verification and rigorously cross-correlated with publication records from a broad array of trustworthy academic sources.
Although not a direct factor in rank determination, the volume of publications in prominent journals and key conference proceedings is considered a valuable secondary indicator of a scientist’s influence and contribution within Environmental Sciences. The ranking position itself is established through the D-index derived from data aggregated primarily from OpenAlex and CrossRef—institutions known for their transparent and dependable bibliometric information. For a detailed account of the methodology, we invite readers to consult our our methodology page.
Research.com’s Mission and Vision
Research.com’s overarching mission in creating this ranking is to inspire researchers, industry leaders, and policymakers worldwide to analyze the trajectories and impacts of leading experts in Environmental Sciences. By providing an accessible and authoritative resource that identifies top-tier scholars in specific disciplines, countries, and institutions, we seek to cultivate a more interconnected and informed global scientific community. Our commitment to meticulous data collection, verification, and transparent methodology underscores our dedication to fostering excellence and collaboration across the scientific landscape.
