Carbon dioxide absorbs and emits infrared radiation.
CO₂ interacts with infrared light at particular wavelengths, a property measured in spectroscopy.
Show me why
Gas molecules do not interact equally with every wavelength. CO₂ has infrared-active transitions. Absorption and emission are part of radiative exchange; how that changes atmospheric energy flow depends on the surrounding conditions.
A common misconception
A gas does not need to be a large fraction of the atmosphere to interact with radiation.
Where the limits are
This property alone does not calculate a particular future temperature.
How we know
NIST provides measured infrared spectra. The linked gas-sensing experiment uses CO₂ absorption near 4.2 micrometers as a measurable signal. These observations support a molecular property; a complete climate calculation also needs atmospheric structure and radiative-transfer physics.
What would change this conclusion?
Repeatable spectroscopy contrary to the measured transitions would require revisiting the molecular account.
Sources you can inspect
- UCAR / Center for Science EducationCarbon Dioxide Absorbs and Re-emits Infrared Radiation
Explains absorption, emission and molecular collisions.
Publication date not stated · Checked in initial research 2026-10-08 - NISTCarbon dioxide — IR Spectrum
Measured spectral evidence.
Publication date not stated · Checked in initial research 2026-10-08 - Ottonello-Briano et al.Carbon dioxide absorption spectroscopy with a mid-infrared silicon photonic waveguide
Primary laboratory absorption measurement.
2019-07-16 · Checked in initial research 2026-10-08
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