What environmental concern involves the release of carbon dioxide into the atmosphere?

The choice that focuses specifically on the release of carbon dioxide into the atmosphere is carbon emission. This term refers to the various processes and activities that result in the output of carbon dioxide, a greenhouse gas, which can significantly contribute to climate change. As carbon dioxide accumulates in the atmosphere, it leads to various environmental issues, notably global warming.

Deforestation is related, as it contributes to carbon emissions by reducing the number of trees that can absorb carbon dioxide, but it primarily refers to the loss of forests. Global warming is the consequence of increased carbon emissions and other greenhouse gases trapping heat in the atmosphere. Ozone depletion, on the other hand, concerns the thinning of the ozone layer in the atmosphere, primarily due to chemicals like chlorofluorocarbons (CFCs), and is not directly related to carbon dioxide emissions. Therefore, carbon emission is the most accurate term to describe the direct release of carbon dioxide into the atmosphere.