I was glad to see that the report also pointed out that a wood fire itself produces a lot of toxins.  Many of the items they tried burning such as used batteries are clearly not appropriate for a campfire.  We usually have very little plastic garbage on canoe trips as we pack most of our food in plastic bags that we clean and reuse at the end of the trip.  If it is just my wife and I we might not even have campfires on a trip.   However, I am not philosophically opposed to burning garbage and in some situations I will burn plastic food wrapping.   Usually that would be for a large family weekend  trip where there is no portaging and a lot more smelly food wrappings than we would normally have on a trip.  One criticism I have of the report is that the fires they were using were not very large.   I would expect that most people burning garbage would have a larger, hotter fire.

I did try burning a disposable diaper around 20 years ago.   Even with a good sized hot fire it took quite a while to burn.   I had to conclude that burning disposable diapers was not a viable alternative to carrying them out.  We had managed to avoid carrying around a bag of poopy diapers on canoe trips by using cloth diapers (though that meant we had to wash them on the trip).  After a bad experience at Booth Lake where it was too damp to dry cloth diapers, we switched to using disposable diapers on canoe trips.