
Nowadays people try to use alternative energy sources wherever it's possible. There are a lot of reasons for this, among which the lack of natural resources and will to protect the environment are the most important. One of the methods to produce power real-time consists in the idea of using human efforts and energy that seems to be promising enough. Gadgets like crowd farm produce electricity when people walk on them, another good idea was to combine a revolving door with an electricity generator.
To my mind in the near future people will start to use such devices because of their efficiency and ecological compatibility. Moreover I hope that more efforts will be made in this domain, i.e. to make the power be generated by our own efforts without making any additional efforts.
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