Now that this topic has been revived, I wish to add that I am against cremation in general for four reasons :
1) it destroys DNA, which makes it impossible for (future) population geneticists to study whole populations if cremation is the norm of that particular society (which is why we have so little Roman-era DNA samples)
2) it prevents a fast recycling of organic matter by other life beings (insects, worms, etc.)
3) on a large scale, when hundreds of millions of bodies are cremated each year, it pollutes the air and increase global warming (just like a coal factory would)
4) it prevents use of the body for science and organs donation to people who need them.