Which country has the highest CO2 emissions?

China has the highest CO2 emissions at 12.2 billion metric tonnes CO2 as of 2023.

Which country has the lowest CO2 emissions?

Niue has the lowest CO2 emissions at 9 thousand metric tonnes CO2 as of 2023.

The global total for CO2 emissions is 37.07 billion metric tonnes CO2 as of 2023.

Guinea-Bissau has the 191st highest CO2 emissions among 212 countries with data in 2023.

How does Guinea-Bissau rank globally for CO2 emissions?: Guinea-Bissau has the 191st highest CO2 emissions among 212 countries with data in 2023.
Which country has the highest CO2 emissions?: China has the highest CO2 emissions at 12.2 billion metric tonnes CO2 as of 2023.
Which country has the lowest CO2 emissions?: Niue has the lowest CO2 emissions at 9 thousand metric tonnes CO2 as of 2023.
What is the global total for CO2 emissions?: The global total for CO2 emissions is 37.07 billion metric tonnes CO2 as of 2023.

Year	CO2 Emissions	Energy Consumption Per Capita	Energy Consumption Per GDP
2023	0.37	2.35	1.03
2022	0.36	2.34	1.04
2021	0.35	2.35	1.08
2020	0.35	2.39	1.13
2019	0.37	2.61	1.23
2018	0.34	2.61	1.27
2017	0.34	2.5	1.24
2016	0.43	3.17	1.6
2015	0.41	3.12	1.62
2014	0.37	3.1	1.66

Source: U.S. Energy Information Administration · Updated March 2026