The primary gas released during combustion is carbon dioxide (CO2). This occurs when organic materials, such as fossil fuels, are burned in the presence of oxygen. The combustion process releases energy, primarily in the form of heat and light, while CO2 contributes to the greenhouse effect, influencing global warming and climate change. Other gases may also be released, but CO2 is the most significant regarding environmental impact. Managing CO2 emissions is crucial for sustainability and combating climate change.