How long does CO2 remain in the atmosphere?1-5 years5-10 years10-20 yearsMore than 200 years

Understanding CO2 Lifetime in the Atmosphere

Carbon dioxide (CO2) has a complex behavior in the atmosphere due to its interactions with various natural processes. While some of the CO2 emitted does get absorbed by oceans and terrestrial plants relatively quickly (within years), a significant portion remains in the atmosphere for a much longer time.

CO2 Lifecycle Overview

1. Immediate Effect: A small fraction of CO2 is absorbed very quickly by natural carbon sinks, such as forests and oceans, which can occur within a few years.

2. Long-Term Presence: The bulk of CO2 emissions can last in the atmosphere for a significantly longer period. It is estimated that some CO2 can remain for decades to centuries, with a substantial proportion lingering for more than 200 years.

Conclusion

Given these factors, the correct answer to the question of how long CO2 remains in the atmosphere is:

More than 200 years.

This aligns with scientific consensus regarding the longevity of carbon dioxide in the atmosphere and its impact on climate change.