Earth’s CO2 Level Rose Every Year Since Climate Change Became a National Issue

1988
> Carbon dioxide (CO2): 350.93 ppm
> Methane (CH4): 1,698.83 ppm
> Nitrous oxide (N2O): 306.49 ppm

1989
> Carbon dioxide (CO2): 352.57 ppm
> Methane (CH4): 1,710.52 ppm
> Nitrous oxide (N2O): 307.48 ppm

1990
> Carbon dioxide (CO2): 353.72 ppm
> Methane (CH4): 1,709.33 ppm
> Nitrous oxide (N2O): 308.78 ppm

1991
> Carbon dioxide (CO2): 355.15 ppm
> Methane (CH4): 1,729.07 ppm
> Nitrous oxide (N2O): 309.57 ppm

1992
> Carbon dioxide (CO2): 355.90 ppm
> Methane (CH4): 1,731.05 ppm
> Nitrous oxide (N2O): 310.00 ppm