Atmospheric CO2

2014

2004

1994

1984

300

325

350

375

400

CO2 parts per million

2014

2004

1994

1984

300

325

350

375

400

CO2 parts per million

2014

2004

1994

1984

300

325

350

375

400

CO2 parts per million

2014

2004

1994

1984

300

325

350

375

400

CO2 parts per million

Guardian graphic

Source: World Meteorological Organization