Carbon dioxide levels refer to the concentration of CO2 in the atmosphere, measured in parts per million (ppm). This gas is a natural component of the air and is produced by processes such as respiration, combustion, and the decay of organic matter. Human activities, particularly the burning of fossil fuels, have significantly increased CO2 levels since the Industrial Revolution. High levels of CO2 contribute to the greenhouse effect, which traps heat in the atmosphere and leads to global warming. Monitoring CO2 levels is crucial for understanding climate change and its impacts on ecosystems, weather patterns, and human health.