Keeping warming below 1.5C would require reaching net zero CO2 emissions before 2040

Global CO2 pathways to stay within various

levels of warming, based on remaining

carbon budgets

Historical

1.5C (275 GtCO2)

1.7C (625 GtCO2)

2.0C (1,150 GtCO2)

40 gigatonnes of CO2 (GtCO2)

Global CO2

pathways

30

20

10

0

1900

1950

2000

2050

2100

Global CO2 pathways to stay within various levels of warming,

based on remaining carbon budgets

Historical

1.5C (275 GtCO2)

1.7C (625 GtCO2)

2.0C (1,150 GtCO2)

40 gigatonnes of CO2 (GtCO2)

Global CO2 pathways

30

20

10

0

1900

1950

2000

2050

2100

Guardian graphic. Source: Global Carbon Project. Note: Global Carbon Project analysis of remaining carbon budgets defined in the Intergovernmental Panel on Climate Change's Sixth Assessment report