Veerabhadran Ramanathan’s path to becoming one of the most influential climate scientists of the modern era was neither planned nor linear. Raised in a small town in southern India, his early aspirations were shaped more by imagination than science. Yet a combination of curiosity, independence, and careful observation would eventually lead him to discoveries that reshaped how the world understands global warming and influenced some of the most consequential climate policies ever enacted.

An Accidental Entry Into Climate Science

Ramanathan arrived in the United States in his twenties, drawn initially by opportunity rather than a specific scientific mission. By the early 1970s, he was working as a postdoctoral researcher at NASA’s Langley Research Center in Virginia. Officially, his work followed assigned research directions. Unofficially, he spent nights exploring a question few scientists were asking at the time: how trace gases in the atmosphere affect Earth’s energy balance.

That independent inquiry led to a striking realization. Chlorofluorocarbons, or CFCs, widely used in refrigerators, air conditioners, and aerosol sprays, were not just benign industrial chemicals. Ramanathan calculated that molecule for molecule, CFCs could trap thousands of times more heat than carbon dioxide. At a time when climate change barely registered in public discourse, the implications were profound.

Unsure how such findings would be received, Ramanathan submitted his paper quietly. When it was published in Science in 1975, the reaction was anything but quiet. The research made the front page of The New York Times, signaling that global warming was not only about carbon dioxide, but also about industrial chemicals accumulating invisibly in the atmosphere.

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Expanding the Greenhouse Gas Paradigm

Ramanathan’s work fundamentally broadened climate science. Until then, most attention focused on CO₂ as the primary driver of warming. His research demonstrated that trace gases such as methane, nitrous oxide, and CFCs could collectively exert a powerful warming influence, despite their relatively low concentrations.

In a landmark 1985 paper, he showed that these gases could accelerate warming far faster than previously assumed. This reframed climate change from a distant, theoretical risk into a near-term challenge with measurable consequences. It also highlighted the complexity of atmospheric interactions, where chemistry, physics, and human activity intersect.

Beyond greenhouse gases, Ramanathan investigated clouds, water vapor, and aerosols, uncovering feedback mechanisms that either amplify or temporarily mask warming. His work on atmospheric brown clouds over South Asia revealed how air pollution could cool regions in the short term while worsening long-term climate and health outcomes.

From Scientific Discovery to Global Policy

Perhaps the most tangible impact of Ramanathan’s research was its role in shaping international climate action. His findings on CFCs provided a scientific foundation for the Montreal Protocol, adopted in 1987. The agreement led to a global ban on CFC production, protecting the ozone layer and preventing an estimated additional one degree Celsius of global warming.

The Montreal Protocol remains one of the most successful environmental treaties in history, often cited as proof that science-driven policy can deliver measurable global benefits. Ramanathan’s work demonstrated that targeted action on specific pollutants could produce rapid climate gains, a lesson that continues to inform debates on methane and other short-lived climate forcers.

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A Career Spanning Science, Policy, and Advocacy

Now in his eighties, Ramanathan continues to shape climate thinking. He is a distinguished research professor at the Scripps Institution of Oceanography, part of the University of California San Diego, where he has mentored generations of scientists. He also serves as a member of the Pontifical Academy of Sciences, advising popes on climate and environmental issues.

His personal choices reflect his scientific convictions. He drives an electric vehicle, powers his home with solar energy, and remains outspoken about the importance of evidence-based science in public decision-making. For Ramanathan, credibility comes from data, not ideology.

Recognition and Lasting Influence

In recognition of his lifetime contributions, the Royal Swedish Academy of Sciences awarded Ramanathan the Crafoord Prize, honoring his role in expanding understanding of how human activities alter the atmosphere, climate systems, and air quality.

Ramanathan’s career illustrates how transformative discoveries often emerge from curiosity rather than grand design. By questioning assumptions and following data where it led, he helped redefine climate science and demonstrated that even unintended insights can change the course of global policy. His legacy continues to influence how scientists, policymakers, and institutions think about climate risks and the pathways to address them.

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