Bibliometric data used to calculate citation-based metrics for this ranking were collected on January 12, 2026. The ranking methodology hinges on the Discipline H-index (D-index), a refined bibliometric measure that evaluates researchers exclusively within a specified discipline. This means that only publications and citation data pertinent to Environmental Sciences were considered in establishing each scientist’s position in the ranking, providing a focused and relevant appraisal of expertise and impact in this field.
Scope of Research and Qualification Criteria
The ranking encompasses an initial dataset of 279,971 scientist profiles identified across all academic disciplines, drawing from diverse bibliometric sources. Of these, 230 scientists specializing in Environmental Sciences were specifically examined for inclusion in this edition.
To qualify for the ranking, a scientist’s D-index had to meet or exceed 30, ensuring that only researchers with a demonstrated and significant impact in Environmental Sciences were considered. Furthermore, a majority of a qualifying scientist’s tier publications needed to fall within the Environmental Sciences domain. Recognition of awards and notable achievements in this discipline also contributed qualitatively to the evaluation process.
The D-index threshold is calibrated dynamically in increments of 10 based on the estimated total number of scholars in each discipline. This approach guarantees the inclusion of the top 1% of leading scholars, preserving the ranking’s exclusivity and rigor. Additionally, a proximity criterion is applied, such that the difference between a scientist’s general H-index and their D-index does not exceed 30%, ensuring alignment between overall citation impact and discipline-specific influence.
Verification Practices and Methodology
Understanding the inherent limitations of raw bibliometric data, the researchers responsible for this ranking have instituted a thorough manual verification process. All scientist profiles were cross-checked against publications indexed in a wide range of trustworthy sources to validate the accuracy and authenticity of the data.
It is important to note that while the number of papers published in prominent journals and conference proceedings does not directly influence a researcher’s rank in the Research.com listing, it serves as a valuable supplementary indicator of scholarly contribution within Environmental Sciences.
The positions in the ranking are derived from each researcher's D-index based on the meticulously gathered data from OpenAlex and CrossRef, recognized as the most authoritative and widely utilized bibliometric databases available to the research community.
For a detailed overview of the methodology and processes employed, interested readers are encouraged to visit our methodology page.
Research.com’s Mission and Commitment
Research.com’s overarching mission in creating this ranking is to motivate researchers, companies, and policymakers globally to monitor the trajectories and focus areas of leading experts. By providing a transparent and data-driven way to identify top scientists in specific fields, countries, and institutions, we aim to foster greater collaboration, informed decision-making, and recognition within the scientific community.
Through this careful and meticulous ranking, we strive to illuminate the landscape of excellence in Environmental Sciences in Italy, offering stakeholders a reliable and authoritative resource to engage with and support the leaders driving innovation and discovery in this critical discipline.
