During the 4.6 billion years of history, the earth has repeatedly warmed and cooled. It is very common for the Polar Regions to have no ice. On the other hand, the theoretical surface temperature of the earth is -18 °C, and due to the presence of greenhouse gases in the atmosphere and their delicate balance, the average temperature is 15 °C, making it a comfortable environment for living things. It is recognized that the current global warming is clearly caused by human influence, even from the rate of temperature rise. Carbon recycling has been proposed as a means to stop this warming. Since most of the current carbon dioxide emissions are generated by combustion of fuel, recycling to fuel would be the main course. This paper introduces recycling technology for methane, a typical fuel, and describes the ideal form of carbon recycling.