claim: 'Mauna Loa has been producing a readout which supports Manning's predetermined goal by showing steady growth in atmospheric CO2 concentrations since 1959.
evidence: The measurements collected at Mauna Loa Observatory show a steady increase in mean atmospheric CO 2 concentration from 313 parts per million by volume (ppmv) in March 1958 to 406 ppmv in November 2018, with an increase of ~2 ppmv CO 2 per year.
category: Keeling Curve