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There is a significant relationship between human and the environment. Now human being has also realized the importance of environment for the entire life form on the earth. Which one of the following is not the reason for optimism, that human is not heading into an environmental battle field?

A)  Development of technology for alternative source of energy

B)  Understanding the importance of environment

C)  The development of genetic modification technology

D)  Understanding of environmental science by human

E)  None of these