United Press International: China is pushing to be an energy efficiency leader. A senior state leader said the country could lead the world in energy efficiency by 2050, China Daily reported. By then, nuclear power and renewable energy is likely to account for at least half of the country’s energy mix, said Lu Yongxiang, vice chairman of the Standing Committee of the 11th National People’s Congress. He is urging policymakers to increase their efforts to develop a long-term plan for China’s energy …