For more than a decade, the climate and health community has worked tirelessly to establish what is now undeniable: climate change is a public health issue. The evidence is extensive. We understand the impacts of extreme heat, deteriorating air quality, changing disease patterns, food insecurity and climate-induced displacement. We have built a compelling case for why health must be central to climate action.
At London Climate Action Week, however, a different conversation was beginning to take shape.
Across discussions with researchers, philanthropists, practitioners and innovators, one theme consistently emerged: the next challenge is no longer building evidence. It is ensuring that evidence drives meaningful change.
That is an important shift.
The question is no longer "Do we know enough?" It is becoming "How do we ensure what we know influences decisions, investments and systems in ways that improve people's lives?"
Evidence has immense value, but its real impact lies beyond publication. It lies in whether it shapes policy, informs financing decisions, strengthens institutions and enables communities to adapt to a changing climate. In other words, the measure of evidence is not simply that it exists, but that it changes something.
One of the more interesting discussions I had was around the changing role of philanthropy. Traditionally, funding conversations often centred on supporting innovative ideas. Today, there is a growing emphasis on what happens after innovation. How does a promising model move beyond a pilot? Can it influence public systems? Is it creating measurable improvements? Can others adopt and sustain it?
These are important questions because they reflect a broader evolution in how systems change is understood.
Innovation remains essential, but innovation alone is rarely transformative. Real change depends on whether ideas can travel…across institutions, across sectors and eventually into policy and practice. It depends on whether different actors are willing to learn from one another, adapt solutions to different contexts and create the conditions for those solutions to endure.
This is where philanthropy can play a catalytic role.
Several conversations highlighted the growing willingness of philanthropic organisations to support ideas that may still be considered too early or too risky for conventional investment. By absorbing that early risk, philanthropy helps generate the evidence, confidence and partnerships that enable governments, markets and larger institutions to engage later. Its value is therefore not only financial—it lies in creating the conditions for innovation to mature into systems change.
For organisations like Swasti, this evolution reinforces the importance of systems leadership.
The next chapter of climate and health will not be shaped by any single innovation or institution. It will depend on how effectively we connect governments, communities, researchers, funders, technology partners and frontline practitioners around shared goals. Evidence, lived experience and innovation each bring something valuable, but meaningful change happens when these perspectives inform one another rather than operate in parallel.
Over the years, Swasti has worked across these intersections - convening diverse actors, enabling collaboration and creating platforms where evidence can inform action, and action can in turn strengthen evidence. As climate and health challenges become more complex, this ability to connect people, institutions and ideas will become just as important as generating new knowledge.
Perhaps that is the transition the climate-health movement is now entering.
The next chapter is about ensuring that evidence influences the choices we make, the partnerships we build and the systems we strengthen.
Because ultimately, the value of evidence is not measured by what it tells us. It is measured by what it enables us to do.
Check out our climatexhealth work here: (https://swasti.org/climate-x-health
