Maps and charts

Climate change indicators

Sources: NASA,; NOAA,; CDIAC,


Since 1958, has shown the concentration of CO2 in the atmosphere is higher each decade than it was the decade before. The increase is accelerating, so that in 2018, it exceeded the 1958 figure by 30%. Over a longer period, of several hundred thousand years, the current increase in the concentration of CO2 in the atmosphere, linked to human activity, is very sudden and unlike any preceding cyclic variations: concentration never exceeded 300 ppmv (parts per million volume) even at the height of the previous four interglacial episodes. As for the global monthly average temperature, the trend is similar: since 1880, the most recent years have always been hotter, while earlier years have been colder.


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