To choose the best way to solve the problem of the green house effect, it is important to evaluate the techniques which have been proposed to take measures to meet the green house effect. By reviewing papers, making inquiries to researchers on the field of environment and energy, and considering by ourselves, 207 items of techniques have been listed. To make a standard to evaluate these techniques, an inquiries was made to choose important indices among 30 items to evaluate the techniques. From the result of the inquiries, it was pointed out that the important indices are 1) the balance between the amount of the effect and the energy to decrease the green house effect, 2) safety, 3) to suppress new pollution, 4) to be appropriate to the nature, 5) not to leave problems to descendants.
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