Data Sources and Citation Metrics
The 5th edition of the Research.com Best Environmental Sciences Scientists in Egypt Ranking is primarily based on extensive bibliometric data collected from OpenAlex and CrossRef, supplemented by multiple other reputable data sources. These sources represent some of the most comprehensive and widely recognized bibliometric databases accessible to the global research community. The citation-based metrics used to devise the ranking were gathered on 2026-01-12, ensuring the evaluation reflects current and verifiable scholarly impact. Each scientist’s position in this ranking is anchored on their D-index (Discipline H-index), a refined metric that measures academic influence by considering only papers and citations pertinent to the Environmental Sciences discipline under review.
Scope of Research and Eligibility Criteria
The ranking encompasses a thorough assessment of 279,971 scientist profiles, extracted from a wide spectrum of bibliometric databases spanning all academic disciplines. Within this dataset, 4,000 scientists specifically working in Environmental Sciences were examined. To qualify for inclusion in the ranking, a scientist’s D-index had to meet a minimum threshold of 30, with the majority of their tier publications demonstrably focused on Environmental Sciences. Additionally, awards and professional achievements within the field were considered as supplementary indicators of distinction.
The D-index threshold is pragmatically adjusted in increments of 10 based on the total number of scholars estimated for each discipline. This approach ensures that the top 1% of leading scientists are consistently incorporated. Furthermore, to guarantee disciplinary relevance, the proximity between a scientist’s general H-index and their D-index must remain within 30%, ensuring that their specialized impact aligns closely with their overall academic profile.
Additional Verification Practices
We recognize that raw bibliometric data alone cannot serve as an absolute measure of scholarly contribution. In light of this, all scientist profiles included in the ranking underwent manual verification by our research team. This process involved meticulous cross-correlation of publications across a broad range of authoritative and trustworthy sources to confirm the accuracy of documented research output.
While not directly influencing the ranking position, the number of papers published in high-impact journals and respected conference proceedings was reviewed as a valuable secondary signal, reflecting the scientist’s contribution and standing within Environmental Sciences. Ultimately, the position in the ranking is established by each researcher’s D-index, calculated exclusively from citation data curated through OpenAlex and CrossRef—the premier bibliometric platforms available.
For a comprehensive understanding of the rigorous methodology used in developing this ranking, readers are encouraged to visit our methodology page.
Research.com’s Mission and Vision
At Research.com, our mission is to empower researchers, academic institutions, industry leaders, and policymakers on a global scale by identifying and showcasing leading experts in specific scientific domains, including Environmental Sciences. Through this ranking, we strive to facilitate greater insight into where pioneering research is headed, enabling the entire scientific community to recognize the contributions of distinguished scientists within various countries and institutions. This initiative embodies our commitment to fostering transparency, collaboration, and informed decision-making across the international research ecosystem.
