Dragan,

Everything comes from the environment and ends up back in it eventually. Excepting the few kilograms we've managed to fling hard enough to reach escape velocity.

It's just so much more practical to convert photons to heat than it is to electrons. We need LCDs Light-Capturing-Diodes. *s*

>OTOH, they were removed from the environment first... but I figure the current generation of solar cells won't get far anyway. It should only serve as a path to something more efficient and creating less waste.