Carbon dioxide( CO₂) is both naturally produced and human made. It is the major component of carbon cycle. Source of naturally produced is from volcanic outgassing, respiration processes of living aerobic organisms and combustion of organic matter.  Human-made sources of CO₂ is burning the fuel ( transportation, power generation and so on). Positive effects are CO₂ involves in photosynthesis process, so it is essential for food producing process. Negative effect is carbon dioxide lead to green house effect, global warming and climate change.