by Daniel and Sidd
While Sidd was in town, I took some notes. Somehow, they turned into this:
Climate Change: The Big Picture
There are many ways to look at climate change. From a micro perspective, there are millions of individual feedbacks operating throughout the Earth system. From a macro perspective, there is the climate system as a whole.
Understanding how those feedbacks interact—and, more importantly, how they feed back into one another—is at the bleeding edge of climate science.
One of the simplest examples is the albedo effect. The physics of ice is straightforward: bright, reflective ice sends a portion of incoming solar energy back into space, while darker ocean absorbs it. Less ice means more absorbed energy and, therefore, more warming.
But the system quickly becomes much more complicated.
How does changing albedo affect cloud formation, particularly over the tropics? And what happens to the climate if those clouds increase—or decrease?
The low clouds are especially important. They can reflect substantial amounts of incoming sunlight back into space. If tropical low clouds diminish, the ocean could absorb significantly more solar energy, accelerating warming.
This is where the bleeding edge begins.
Clouds are arguably the largest remaining uncertainty in our understanding of climate sensitivity. They can both reflect incoming solar radiation and trap outgoing heat. Which effect dominates—and how that balance changes as the planet warms—is one of the great questions in climate science.
My expectation is that the climate system could eventually approach a new equilibrium around +4°C above the preindustrial baseline, perhaps over the course of a couple centuries. That would imply roughly +2–3°C this century, with additional warming continuing into the next.
But that remains uncertain.
The important point is that climate change is not a simple linear equation. It is a massively interconnected system in which changes in one component can alter another, which then feeds back into the first. Ice affects albedo. Albedo affects heating. Heating affects clouds. Clouds affect radiation. Radiation affects ocean temperatures. Ocean temperatures affect evaporation and atmospheric moisture. And the cycle continues.
Everything is nonlinear.
Yet uncertainty about the exact trajectory does not mean uncertainty about what we should do.
The clearest lever we have is still the same: reduce CO₂ emissions and slow the accumulation of greenhouse gases in the atmosphere.
And while the long-term equilibrium matters, there is a much more immediate question.
What happens to you over the next five years?
We are already seeing rainfall becoming more intense and, in many places, more destructive—violent. A warmer atmosphere can hold more water vapor, increasing the potential for extreme precipitation. The question isn’t simply how hot the planet might become over the next 50 years.
The more immediate question is:
What is the violent rain going to do to your home, your community, your infrastructure, your insurance—and you—over the next five years?
That is where climate change stops being a distant projection and starts becoming a personal reality.
