What are the two ways in which cow-dung can be used as a fuel? Which of them is better and why?
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Two ways in which cow-dung can be used as a fuel are:
- In the form of cow-dung cakes, which can be used directly as a fuel.
- By preparing biogas from cow-dung. Biogas is better than cow-dung cakes because it gives a cleaner than cow-dung cakes and after extracting biogas, the spent cow-dung can be used as a manure.
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