Answer :
Simple and easy but three sources are:
1. Decomposition
2. Ocean Release
3. Respiration
1. Decomposition
2. Ocean Release
3. Respiration
Answer:
Yes, there are natural sources of atmospheric carbon dioxide, such as outgassing from the ocean, decomposing vegetation and other biomass, venting volcanoes, naturally occurring wildfires, and even belches from ruminant animals.[1]
[1](www.climate.gov/news-features/climate-qa/doesnt-carbon-dioxide-atmosphere-…)