It is reported that Birol, chief economist of the International Energy Agency (IEA) at the 21st World Energy Conference held in Montreal on September 12th, said that several major factors will affect the future of the energy industry: uncertainties in economic recovery, shale gas And climate change policies, the slow response of the oil market to changes in oil prices, China’s influence on the expansion of the global energy market, and the shift in the role of public energy policies. Billow believes that the global energy industry will enter an "unprecedented period of uncertainty."