On rainy afternoons I end up reading a mix of science essays and watching climate documentaries, and one thing keeps sticking with me: climate change is absolutely a physical science topic because it’s built on measurable, testable physics and chemistry. The greenhouse effect itself is just radiative transfer — photons in, photons out — but shifted by gases like CO2 and methane that change how energy flows through the atmosphere. That’s textbook physics: conservation of energy, spectroscopic absorption lines, and thermodynamics. Observations from satellites, weather balloons, ocean buoys and ice cores are concrete data points that scientists use to test hypotheses and refine models.
What really convinces me are the experiments and models. In labs you can isolate processes — say, how water vapor affects infrared radiation — and in the field you can measure ocean heat uptake and melting glaciers. Global climate models couple fluid dynamics, radiative physics, chemistry, and even solid Earth processes; they’re big numerical experiments based on first principles. I still enjoy pulling out graphs that show radiative forcing and ocean heat content and thinking, okay, the physics adds up here, even if translating that into policy is a whole other conversation. Watching 'An Inconvenient Truth' years ago made the political side loud, but the grounding is pure physical science for me.