For religious folks, the Bible makes it clear; “Dust thou art, and unto dust thou shalt return” (Genesis 3:19). For non-believers, it’s ”nature at work”. Decomposition of the organic material (including our loved ones) should not be prevented, it is against the laws of nature and we know that humankind can not beat the nature,so all those preservation studies are vain attempts. Actually Orthodox Jews and Muslims encourage their flock ”green burial” in order to accelerate the natural decomposition process. In Israel, people are buried without coffins, just with tallit (burial shroud) because they take the Biblical verse literally. I think we should bury our deceased in coffins due to sanitary reasons (without a coffin or container, you can still smell the stench of rotting flesh buried underground through soil cracks when it’s hot in summer) but all those so-called ”protective,sealed” caskets are useless money traps. And i think those casket manufacturers should stop selling such ”sealed caskets” and they should produce coffins which would allow the natural decomposition instead, as the way it should be!