In 2013, published results showed that the world's proven natural gas reserves totaled 22 billion cubic meters. Natural gas contributes a quarter of global energy. At the current rate of consumption, only 65 years of energy supply can be provided. 
With the development of exploration technology, the proven reserves of natural gas in the world are much higher than before.
 in order to avoid the dilemma of no natural gas available, more alternative energy sources must be developed.