Carbon dioxide is a chemical compound with the chemical formula CO2. It is a naturally chemical compound composed of two oxygen atoms and a single carbon atom. Carbon dioxide has a pungent, colorless odor and a sour taste. This substance can remain in the atmosphere for fifty to two hundred years. It is formed during fermentation, during the combustion of carbon-containing materials, during organic decomposition and during animal respiration and is used by plants in the photosynthesis of carbohydrates. Not only the natural process that can produce carbon dioxide, but humans also participate in the production of carbon dioxide. The largest contributors of human-produced carbon dioxide come from transportation, manufacturing, and construction. Besides the burning of fossil fuels in vehicle engines, deforestation is also the main factor that increases carbon dioxide emissions into the atmosphere. Humans can use carbon dioxide for many things, for example in the chemical industry, the food industry and the oil industry. Chemical industry factories use carbon dioxide to make fire extinguishers. The food industry can use carbon dioxide to make beverages such as sparkling water and soft drinks. Then it is also often used for fermentation in the winemaking process to quickly cool the grape clusters. Carbon dioxide can be used by oil plants to improve oil recovery. Carbon dioxide also has certain negative effects that can be dangerous to human health and harmful to the global environment. If man inhales too much carbon dioxide, it will cause rapid fatigue, visual impairment and headaches. Additionally, carbon dioxide will increase the acidity of the blood and a small change in blood pH will kill a person from acidosis. Carbon dioxide can control the atmosphere of the middle of the paper. Concentrations of methane in the atmosphere have recently doubled, which is why it is important for us to reduce methane emissions. The main source of methane in the atmosphere is produced by anthropogenic activity, such as the burning of forests and land, as well as the digestive processes of ruminants. The methane production of ruminants is affected by two main factors: the digestibility of the feed and the quantity of feed ingested. Animal nutrition researchers and scientists are looking for ways to reduce methane emissions from ruminants such as cattle to improve livestock production and solve the environmental problem. In conclusion, not only can carbon dioxide harm the atmosphere, but methane also contributes to increasing the Earth's temperature. We should reduce methane emissions to save and repair the global environment.