Methanation is the process of converting carbon dioxide and hydrogen gas into methane gas. This chemical reaction is often used to create synthetic natural gas, which can be used as a fuel source. There are several synonyms for methanation, including carbon monoxide reduction, carbon dioxide reduction, and hydrogenation. Other terms that can be used to describe this process include methanogenesis, methanol synthesis, and carbon fixation. Regardless of the terminology used, the goal of methanation is to create a clean and efficient energy source that can help reduce our reliance on fossil fuels and lower our carbon emissions.