The most significant greenhouse gas produced by human activity is carbon dioxide (CO2). This gas is primarily a result of burning fossil fuels for energy, transportation, and industrial processes. Deforestation also contributes to increased CO2 levels since trees absorb carbon dioxide as part of photosynthesis. The rise in atmospheric carbon dioxide is a major driver of climate change, trapping heat in the Earth's atmosphere and leading to global warming. Efforts to mitigate CO2 emissions include transitioning to renewable energy sources, improving energy efficiency, and enhancing carbon capture and storage technologies.