However, resource depletion and climate change are now the main reasons to explore alternative energy sources. Governments, companies, and innovators have been experimenting with alternative energy sources and renewable electricity. Wind turbines, solar energy, hydrogen, biogas, and biofuel have been some of the options. Some of them may last and are growing, and some of them have been forgotten for their cost and/or their partial effectivity. In any case, alternative sources for harvesting energy is one of the main global challenges today.
Reverse engineering, R&D, and innovation are allowing us to discover new alternatives. In recent years, a new one seems to be emerging slowly but steadily: harvesting energy from the sound. Entrepreneurs, companies, young innovators, and universities are developing prototypes that can transform noise into electricity capable of powering bulbs.