List of the 20 countries that emitted the most carbon dioxide in 2015 (the most recent available data). Source:  Union of Concerned Scientists.

2015 total emissions country rank

Country

2015 total carbon dioxide emissions from fuel combustion (million metric tons)

2015 per capita carbon dioxide emissions from fuel combustion (metric tons)

1

China

9040.74

6.59

2

United States

4997.50

15.53

3

India

2066.01

1.58

4

Russia

1468.99

10.19

5

Japan

1141.58

8.99

6

Germany

729.77

8.93

7

South Korea

585.99

11.58

8

Iran

552.40

6.98

9

Canada

549.23

15.32

10

Saudi Arabia

531.46

16.85

11

Brazil

450.79

2.17

12

Mexico

442.31

3.66

13

Indonesia

441.91

1.72

14

South Africa

427.57

7.77

15

United Kingdom

389.75

5.99

16

Australia

380.93

15.83

17

Italy

330.75

5.45

18

Turkey

317.22

4.10

19

France

290.49

4.37

20

Poland

282.40

7.34