[FLPERMACULTURE] newsprint and cardboard OK to compost?

[Margaret McCasland]

A question came up on the Sustainable Tompkins list-serve.
Does anyone know how safe newspapers and regular (brown) cardboard 
are to use as mulch in gardens or yards?
Are there  potential hazards, such as chemicals we don't want in out 
soil, groundwater or plants?  They presumably are chlorine-free (not 
being bleached), so they shouldn't be a source of dioxins.
Thanks, Margaret