Energy technologies and new materials.

Until recently, the earth has been so big as to be seemed limitlees and unchanged. However it is observed that human activity adds about 1.4 ppm per year of CO2 to the atmosphere by fuel combustion. And now it is feared that the increased level of CO2 would cause some world wide greenhouse effect enough to change the climate.This makes the new energy technologies such as solar, wind, and geothermal etc. the key answer to a near future crisis in how the world utilizes energy. Among them, new materials are the most important factor for research and development.