The year you arrived
Planetary health · Interactive experiment
The planet has changed since you were born. See how much.
Enter a year. Travel through the atmosphere's history. Discover how much carbon dioxide has changed in a single lifetime.
—Atmospheric CO2 in your year · parts per million (ppm)
427.35Atmospheric CO2 in 2025 · parts per million (ppm)
—Increase · parts per million (ppm)
What does ppm mean? Parts per million (ppm) measures how much carbon dioxide is in the atmosphere. For example, 427 ppm means approximately 427 CO2 molecules in every million molecules of dry air. These figures are annual observations from Mauna Loa, Hawaii, not live global readings.
A colossal comparison
Atmospheric CO2 mass increase, not cumulative emissions. Approx. 7.8 billion tonnes CO2 per ppm; Great Pyramid comparison uses an illustrative mass of 5.75 million tonnes. Approximate, not a direct weighing.Scan to explore your personalised CO2 Time Machine result. Every year has its own permanent link.
Source: NOAA Global Monitoring Laboratory, Mauna Loa annual mean CO2, 1959–2025. These are annual observations at one monitoring station, not a real-time global reading. Values may be revised by NOAA. The 2025 annual mean is the latest complete year shown. This chart measures atmospheric concentration, not carbon removal attributable to any project.