Natural gas. According to China Chemical Network, natural gas saves money. Natural gas is cheaper than liquefied gas, and the price of natural gas is more than half cheaper than liquefied gas when it is used, and it is safe. Natural gas refers to all natural gas, including gases formed by various natural processes in the atmosphere, hydrosphere and lithosphere (including oilfield gas, gas field gas, mud volcano gas, coalbed methane and biogas, etc.). ).