Finding alternatives sources of electricity and utilizing them will go a long way in making the earth safe from harm. Piezoelectricity is a good discovery. I remember reading that piezoelectricity was used to power so millitary gadgets. They did this by placing piezolectric transducers under the boots of the solders. Although, it provided some discomfort and the power derived was not substantial.

Reverse piezoelectricity is perhaps more common. For instance, in the generation of ultrasonic waves used in medicine (ultrasound scan) and even engineering like for non-destructive testing.

Quite informative, well done!