CO₂, carbon dioxide. The formula of a compound shows how many atoms of each element are bonded together. The formula is made up of symbols and numbers. The numbers are written as subscript ...

During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen. These sugar molecules are the basis for more complex molecules made by ...

One carbon credit is equivalent to 1,000 kilograms of carbon dioxide. By limiting the number of carbon credits that are issued, governments can control how much carbon is released into the ...