ABSTRACT
We have been relishing a lot of af»uence thanks to energy. Fossil energy provides us fun to drive, warmth to escape from cold, brightness of illumination, etc. However, drying up of oil is feared recently. Moreover, consumption of fossil fuel produces carbon dioxide. Carbon dioxide is considered as a greenhouse gas and emitted from many places, for example, power generation, industry, transport, agriculture, and waste disposal. The amount of carbon dioxide emission will increase with increasing consumption of fossil energy, gas, oil, and coal year by year (Figure 4.1).1 It is predicted that the amount of CO2 emission in 2030 will reach almost twice as much as in 1990.
