For decades, the global response to climate change has been organized around two pillars: mitigation and adaptation. Mitigation seeks to reduce greenhouse gas emissions; adaptation seeks to manage the consequences of a changing climate. Both are necessary. Neither is sufficient.
We are now confronting a reality that demands a third pillar: repair.
This is not an argument that mitigation has failed, nor that adaptation is futile. Rather, it is an acknowledgment that the scale, persistence, and accumulated nature of climate change have transformed the problem. Climate change is no longer simply a matter of preventing further harm. It is now a matter of actively reversing damage that has already been done.
Humanity has moved from a prevention problem to an engineering problem.