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Waste vegetable material can be fermented to produce methane which can be burned or used in a heat engine to drive a generator. This is renewable energy which means we are able to use less fossil fuels (coal, oil and natural gas) to generate electricity.

A:You can eat the pumpkin, and then attach your bike to a dynamo machine and charge up your batteries. With the waste material, you can buy a Biothermal generator. I don't know how much these cost, or even if small ones are available to the general public. Some countries use Biothermal power plants to turn the methane given off by rotting material into energy.
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