What is the main gas accounted for in global warming?

The main gas accounted for in global warming is carbon dioxide (CO₂). This gas is primarily produced from human activities such as burning fossil fuels for energy, transportation, and industrial processes. Once released into the atmosphere, carbon dioxide has a significant greenhouse effect, trapping heat and contributing to the rise in global temperatures.

While methane is also a potent greenhouse gas, its concentration in the atmosphere is much lower than carbon dioxide, despite being more effective at warming the planet on a per-molecule basis. Water vapor, although the most abundant greenhouse gas, acts as a feedback mechanism rather than a direct cause of climate change, as its levels are largely controlled by temperature. Nitrogen oxide, while it can contribute to atmospheric reactions affecting air quality and health, is not a primary contributor to global warming compared to carbon dioxide. Thus, carbon dioxide remains the most significant and widely recognized gas linked to climate change and global warming.