1.8M Climate Papers Ranked: Carbon Brief Reveals Top 500 Authors & Institutions

For climate professionals, understanding the bedrock of climate science is critical. The Cosmos 500 ranking reveals where the most influential research comes from, who produces it, and how methodological tools shape the field. But the findings also expose stark inequalities: US dominance under political threat, minimal global south participation, and a gender gap that could bias the solutions we rely on.

Carbon Brief has unveiled its Cosmos 500 rankings, a landmark analysis that mines the organisation's vast Project Cosmos database—comprising over 1.8 million climate research publications from nearly a century—to identify the most highly cited publications, authors, and institutions in the field. The rankings, released on 22 June 2026, provide an unprecedented view of the foundational building blocks of climate science, revealing that the most influential works are not sensational blockbuster studies but methodological tools, statistical methods, and critical datasets. The top-ranked publication is the reference index for the R programming language, a sprawling 4,000-page document that underpins statistical analysis across countless climate studies. This technical manual has earned its place by being cited thousands of times within the Cosmos database, outpacing traditional research papers. The finding underscores how the infrastructure of science—tools and methods—often exerts the greatest influence.

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The author rankings are topped by French researcher Prof Philippe Ciais, who earned a citation score of 69,655 for his work on global carbon cycle modelling.

The author rankings are topped by French researcher Prof Philippe Ciais, who earned a citation score of 69,655 for his work on global carbon cycle modelling. Following him are Prof Phil Jones and Prof Francis Stuart Chapin III. The institution rankings place the French National Centre for Scientific Research (CNRS) at number one, with a publication count of 864,154, reflecting the output of its nearly 30,000 scientists. These metrics are derived from OpenAlex, an open-source academic catalogue, and count each author affiliation occurrence.

However, the rankings also expose stark geopolitical and demographic imbalances. Over one-third of the top 500 institutions are based in the United States, a concentration that faces existential threat from the Trump administration's ongoing attacks on climate science funding. Analysts note that this could undermine the very foundations of global climate research. Meanwhile, institutions from the global south account for only 30 entries—around half of which are in China—highlighting a severe underrepresentation of developing-world perspectives in the most visible research. The author list is similarly skewed: only 10% of the Cosmos 500 authors are women, and the first 35 entries are all men, revealing systemic gender gaps that persist in climate science.