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

Global CO2 pathways using IPCC AR6

remaining carbon budgets

Historical

1.5C – 275 GtCO2

1.7C – 625 GtCO2

2.0C – 1,150 GtCO2

40

Global CO2

pathways

30

20

10

0

1900

1950

2000

2050

2100

Global CO2 pathways using IPCC AR6 remaining carbon budgets

Historical

1.5C – 275 GtCO2

1.7C – 625 GtCO2

2.0C – 1,150 GtCO2

40

Global CO2 pathways

30

20

10

0

1900

1950

2000

2050

2100