Climate change can drive an increase in atmospheric CO2 through carbon cycle feedbacks, as warming temperatures and changing environmental conditions cause terrestrial and marine ecosystems to release stored carbon.
The retrieved papers consistently report that climate change and warming temperatures induce carbon cycle feedbacks—such as permafrost thaw, increased ecosystem respiration, and reduced sink efficiency—which release stored carbon back into the atmosphere and elevate CO2 concentrations. Therefore, the claim is well-supported by multiple studies.