The gas most commonly responsible for climate change is carbon dioxide (CO₂). While various greenhouse gases contribute to global warming, CO₂ is the most significant due to its volume and longevity in the atmosphere. It is released through natural processes like respiration and volcanic eruptions but is significantly heightened by human activities such as burning fossil fuels, deforestation, and industrial processes. This increase in atmospheric CO₂ traps heat in the Earth's atmosphere, leading to temperature rises, climate disruptions, and impacts on weather patterns and ecosystems.