Atmospheric carbon dioxide measurements from 1958-2024
These charts show monthly atmospheric carbon dioxide concentrations and a deseasonalized trend line. The seasonal cycle rises and falls each year, but the long-term direction is steadily upward.
CO2 traps heat in the atmosphere. Rising concentrations are one of the clearest measurements of the human-driven changes behind global warming, sea-level rise, and intensifying climate risks.
Cutting fossil fuel use, electrifying buildings and transport, protecting carbon-rich ecosystems, and expanding clean energy all reduce the rate at which CO2 accumulates.