Carbon dioxide (CO2) is an odorless gas that is highly important to life on Earth. CO2 is also known as a greenhouse gas; an excessive concentration can disrupt the natural regulation of temperature in the atmosphere and lead to global warming. Greenhouse gases trap heat and make the planet warmer. Human activities are responsible for almost all of the increase in greenhouse gases in the atmosphere. The concentration of CO2 has especially increased as a result of the industrial revolution and exponential growth in manufacturing activities around the world. Deforestation, agriculture, and fossil fuel use are the primary sources of CO2.
Here are the top 10 largest emitters of Carbon Dioxide (CO2) in the world.
| Rank | Country | CO2 emissions |
| 1. | China | 11.68 billion tonnes |
| 2. | United States | 4.54 billion tonnes |
| 3. | India | 2.41 billion tonnes |
| 4. | Russia | 1.67 billion tonnes |
| 5. | Japan | 1.06 billion tonnes |
| 6. | Iran | 690.24 million tonnes |
| 7. | Germany | 636.88 million tonnes |
| 8. | South Korea | 621.47 million tonnes |
| 9. | Saudi Arabia | 588.81 million tonnes |
| 10. | Indonesia | 568.27 million tonnes |
