China's energy consumption has climbed year by year and now is bumping up against a resource shortage and ecological pressures.Abalance in economic development, energy security and environment sustainability is necessary.For coordinating the "3E's" developed countries rely on the International Energy Agency.For 40 years the IEA has accumulated experience in matters such as building up strategic oil storage,dealing with energy supply crises, coordinating energy policy, optimizing energy structure and improving energy efficiency.China has not joined the IEA.Should it? What is their relationship and what does it presage?