An incinerator is what things are burned in.
An incinerator is used to burn waste materials.
They were the crematoriums it the concentration camps. When the prisoners died the bodies were burned in a crematorium.
because it is
see the article in popsci: http://www.popsci.com/scitech/article/2007-03/prophet-garbage?page=1
Theres nothing left of the item so it doesnt pile up in dumps...but i bet the pollution would be massive....