Last year I produced a public radio special called "Sustaindinavia!" about waste-to-energy plants in Copenhagen, Denmark. To Diveguy's concern about stack emissions, I stood below the stack outside a fully operating W2E plant on a clear day and could see nothing coming from it. The advanced scrubbing and filtering technologies they use are impressive. Another key to low toxicity is a legal restriction on what can go into the trash. PVC, for example, must be disposed of separately so as not to burn it. Here's the podcast of the radio program --
http://energypriorities.com/2011/12/sustaindinavia-copenhagens-integrated-approach-to-energy/ 
