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I hear that once upon a time,the Chinese thought the sparrows ate their crops off. So they ate, or destroyed the common sparrow. But then they had the problem of worms and caterpillars. Playing with nature wholesale may not be a good idea. I would say try a few farms at a time and see, and leave the rat races and gold rushes to us the Americans. The trouble is there are so many parameters and however much we know some may still be hidden and ignoring them could have devastating effects.
Muhammad Zafrullah