The chemical released during combustion is primarily carbon dioxide (CO2), along with other byproducts such as water vapor and various pollutants depending on the material burned. During combustion, organic substances react with oxygen, resulting in the release of energy and the formation of these gases. Fossil fuels, wood, and biomass generate CO2, which contributes to global warming and climate change. Understanding combustion is crucial for developing more sustainable energy practices and reducing environmental impacts.