Preindustrial
CO2 278 ppm
CO2 278 ppm
CO2 emissions are cumulative in the atmosphere due to ultra-long CO2 atmospheric life-time 20% remains at 1000 years. CDIAC mean 200 years
NOAA ESRL Greenhouse gas concentrations
Dec.2023
Atmospheric CO2: 422.48 ppm
NOAA
Atmospheric CO2: 422.48 ppm
NOAA
Unprecedented rate of atmospheric CO2 increase
Multiple lines of evidence show that the rate at which CO2 has increased in the atmosphere during 1900–2019 is at least 10 times faster than at any other time during the last 800,000 years, and 4–5 times faster than during the last 56 million years
(IPCC AR6, WG1, 5-676)
Multiple lines of evidence show that the rate at which CO2 has increased in the atmosphere during 1900–2019 is at least 10 times faster than at any other time during the last 800,000 years, and 4–5 times faster than during the last 56 million years
(IPCC AR6, WG1, 5-676)
CO2 past 2000 years Abrupt increase
CO2 past 10,000 years 50% higher
Atmospheric CO2 highest in 14 million years
IPCC AR6 record from 800,000 years ago
Scripps: Accelerating fossil fuel atmospheric CO2 and cumulative CO2 emissions (tracking worst-case scenario RCP8.5)
State of Our Climate
Emissions
Emissions