How is organic farming useful?

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Question by student: How is organic farming useful?
I have my geography exam some days later. I have been given this question by the teacher and some other questions too. I have found the answers to some of them in my geography book. But I cannot find the proper answer to this question. In my book it is not written how it is useful. But there it is written about a project (organic farming) conducted by an organization and it is written that how that project worked. I need the answer very urgently. Please help me. And thanks for helping me in advance!
Write in 5 sentences if you can.

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