Global warming should be an urgent issue to be undertaken by all the major economies in the world. Simultaneously, developing countries, especially the least developing countries, need to achieve economic growth to provide better living standard to their people, most of who are facing difficult life because of low incomes and growth of economies. In order to achieve necessary growth, those countries surely need supply of primary energy, mostly oil and coal, to be increased, since many of those countries do not have any facility or technology to utilize renewable energy yet, such as wind or solar and need to consume conventional energy sources with current equipment. How we can fight with climate change, achieving economic growth of developing countries, which still need large amount of fossil fuels supply. We seem to be facing difficult task. One of the answers is transfer of technology, which we have in Japan, to developing countries for improving efficiency of energy related plants, and rehabilitation or renovation of old facility to save energy consumption and reduce greenhouse gases.