![](https://247wallst.com/wp-content/uploads/2021/11/imageForEntry5-nLq.jpg)
Source: David McNew / Getty Images News via Getty Images
2003
> Carbon dioxide (CO2): 375.08 ppm
> Methane (CH4): 1,777.41 ppm
> Nitrous oxide (N2O): 318.21 ppm
![](https://247wallst.com/wp-content/uploads/2022/08/imageForEntry17-YAh.jpg)
Source: Thinkstock / Stockbyte via Getty Images
2004
> Carbon dioxide (CO2): 376.61 ppm
> Methane (CH4): 1,775.44 ppm
> Nitrous oxide (N2O): 318.93 ppm
![](https://247wallst.com/wp-content/uploads/2022/08/imageForEntry18-R3s.jpg)
Source: EdStock / iStock via Getty Images
2005
> Carbon dioxide (CO2): 378.97 ppm
> Methane (CH4): 1,774.55 ppm
> Nitrous oxide (N2O): 319.60 ppm
2006
> Carbon dioxide (CO2): 381.17 ppm
> Methane (CH4): 1,776.40 ppm
> Nitrous oxide (N2O): 320.37 ppm
![](https://247wallst.com/wp-content/uploads/2022/08/imageForEntry20-qYF.jpg)
Source: costbenefit / Flickr
2007
> Carbon dioxide (CO2): 382.89 ppm
> Methane (CH4): 1,781.75 ppm
> Nitrous oxide (N2O): 321.14 ppm