Natural gas is considered a fossil fuel and its combustion results in the emission of greenhouse gases, including carbon dioxide (CO2). While natural gas emits less CO2 than other fossil fuels like coal and oil, its combustion still contributes to the accumulation of greenhouse gases in the atmosphere.

Estimates suggest that when burned, natural gas emits about 53 metric tons of carbon dioxide per terajoule (TJ) of energy produced, which is roughly equivalent to 117 pounds of CO2 per million British thermal units (MMBtu) of energy.

While natural gas is often touted as a cleaner alternative to other fossil fuels, it's important to recognize and work towards reducing its CO2 emissions to mitigate climate change. The energy industry and governments are actively exploring various technologies and strategies, such as carbon capture and storage (CCS) and renewable energy integration, to minimize CO2 emissions from natural gas and transition towards a more sustainable energy future.