A "Stirling Idea", came from the idea of a Stirling Engine.
Philips Radio made one for the bush and all you need is very little heat.
It runs a generator, there ought to be one in every back yard.
But no, the Corporates "bury" the idea

Scroll down to
Twentieth century revival
http://en.wikipedia.org/wiki/Stirling_engine

If Philips Radio made one out of genuine necessity to power up their radios when no electricity was available, then why not have one now in production?

There are plans to make one out of a coke can, and it will power up from as little heat as a coffee cup, just to point out the principle.

http://www.scraptopower.co.uk/can-s...stirling-engine