The planetary air conditioner
If a free energy device (like this one) were really possible, simple economics would dictate that (as soon as patents expired, etc.) one or several would be found in every cell phone, iPod, notebook computer, desktop computer, appliance, automobile, airplane, house, building, and factory. That’s a lot of waste heat that would get dumped onto the planet’s surface, maybe even worse than burning-stuff-to-produce-greenhouse-gasses.
But if you have unlimited energy, it would be straightforward engineering to produce a large scale air cooling unit that would (beam|radiate|dissipate) heat into space. In effect, a planetary-scale air conditioner.
Remember when you were younger and you left a window open with the A/C on, and somebody said ‘what are you trying to do, cool off the whole outdoors?’ Finally an answer to that question. :)
November, National Novel Writing Month, is coming up. Could this be the kernel of a story? What other practical considerations would there be around free energy? Comment below.