Here's how it works:

1. Cellular Respiration: All living organisms, from plants to animals, need energy to survive. They obtain this energy by breaking down food molecules, such as sugars (glucose).

2. Glucose Breakdown: This breakdown happens through a process called cellular respiration, which requires oxygen and releases carbon dioxide as a byproduct.

3. Carbon Dioxide Release: The carbon dioxide produced during respiration is then released into the atmosphere, where it can contribute to greenhouse gases.

Example: When you breathe out, you are releasing carbon dioxide that your body produced during respiration.

Here are some other ways living things release carbon into the air:

* Decomposition: When organisms die, decomposers (like bacteria and fungi) break down their bodies, releasing carbon dioxide in the process.

* Burning of Biomass: The burning of wood, crops, and other plant matter releases carbon dioxide into the atmosphere.

It's important to note that while living things release carbon dioxide, they also play a crucial role in removing carbon from the air through photosynthesis, the process plants use to make food. This balance between carbon dioxide release and absorption is important for maintaining the Earth's climate.