CO2 levels in the atmosphere
Weekly averages 22 September 2019: 408.32 ppm 3 October 2018: 405.63 ppm 3 October 2009: 384.73 ppm Pre-industrial base: 280 Safe level: 350 Atmospheric CO2 reading from Mauna Loa, Hawaii (part per million). Source: NOAA-ESRL (Source: The Guardian, October 2019)
