The most important number of the climate crisis: 422.1 - atmospheric CO - 2 - in parts per million, 4 May 2024 - Source: NOAA. Chart baseline is 280ppm - the preindustrial average. Safe level a stabilisation scenario set out by IPCC. Label number is the trend, not cycle, value. 72.1 - above safe level, passed 1990 - 24.9 - increase in past 10 years - 280 - 300 - 320 - 340 - 360 - 380 - 400 - 420 parts per million - 1960 - 1990 - 2014 - 2024 - Safe level: 350ppm - Latest: 422.1ppm

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