How to destroy CD?

It isnt easy task.. How to destroy data on CD or DVD, and not damage it, so all problematic molecules from organic colors wouldnt damage earth? Plextor thinks, that they solved problem. Solution is called PlexEraser PX-0E100E, and it looks just as normal optical mechanic. And it is in innards probably similar, but it dont read CDs. Instead of it, they are being burned again, not important by what data.. After few minutes, CD (DVD) contains much more zeroes than before, and all private data burned on it are destroyed. Only one thing is really annoying. That thing which is absolutely similar to any normal CD Writer should cost 250$.