Can energy be generated out of waste?

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Energy can be generated from waste. The waste is made into small pellets also referred to as refuse derived fuel. The calorific value of this product is quite close to coal and therefore it can be a good substitute for coal, wood, etc. In nature nothing is wasted, predator animals in the forests kill only when they are hungry. When an animal is killed by a lion or a tiger, not only do a host of other animals benefit from the kill but at the end, what little is left is broken down by microscopic organisms. Once the predator has eaten its share, the predator has eaten its share, scavengers like the hyena feed on the remains. What is left of the bones attract insects such as flies, etc. The leftovers are broken up microorganisms like the bacteria and the fungi. This is a perfect example of ‘want not waste not’.