In view of problems of global warming, soaring oil prices and threats to energy security, the long term strategies of China, the United States and Japan for energy technology development are illustrated. Giving an overview of the 21st century technologies aiming to improve the energy efficiency and energy saving in industry, transportation, building and cross-sector industries and looking ahead to the prospects of the clean power generation technologies and CO2 capture and sequestration (CCS) in the 21st ce...