Atmospheric concentration of methane
Methane concentration, parts per billion
1,950
1,900
1,850
1,800
1,750
1,700
1,650
1,600
1990
2000
2010
2020
1,950
1,900
1,850
1,800
1,750
1,700
1,650
1,600
1990
2000
2010
2020