Respiration of organisms, Burning fossil fuels, from oceans, From natural disasters, and photosynthesis.
Explanation:
- Industry, agricultural activities, transportation and petroleum are the common activities where usually the fossils being burned. And burning fossil fuels like natural gas, coal and oil will emit CO2 in the atmosphere.
- Animals and human beings are emitting CO2 through respiration.
- There natural disasters like forest fires and volcanic eruptions are also emitting CO2 in the atmosphere.
- Plants are emitting CO2 after photosynthesis.
- Oceans are the biggest source of CO2 and they are emitting a large amount of CO2 in the atmosphere.
