Recently I finished house renovation and paid (not a small sum) to dispose of almost 3 metric tons of "cunstruction garbage". It contains metals, rocks, different finishes, detergents, fire retardants, plastics, glass, stained wood, paints with whatewer inside...
So in my lifetime I will produce ~70kg of corpse garbage + coffin etc, and compare this to 3000kg. Well I do not know what is more dangerous... Add to this usual daily household garbage, which is not sorted and recycled 100%, I find body disposal not the most pressing problem.