My father was a chemist and a life-long, devout atheist. He hated religion. One of his goals in life was to leave the minimal mess and expense behind. Even though he lived to 95 years, and we had plenty of time to arrange things to his wishes, it was very difficult.
We tried to enable a burying of his naked corpse on our farm, but it wasn't allowed...mostly because there was no pre-existing cemetary on the land.
He was opposed to cremation because of the foolish expense, and the net loss of energy.
Why waste all that fossil fuel to dispose of a corpse? (Not a sentimental guy)
Anyway, after exhausting all possible alternatives, we were forced to go with cremation.
It would have annoyed him to know that it cost over 1000 dollars; required a long drive, and used a lot of propane. We also had to pick up the ashes at the creamatory. They wern't allowed to simply dump them in the trash.
It is strange how difficult it is to leave this life without leaving a mess behind...at least in the U.S.
If one really wanted to have the minimal impact, as my dad did, you would have to start struggling for it years before death. Even so, it would be nearly impossible to have that last, humble wish fullfilled. I find that to be fundamentaly disturbing. There should be some sort of net energy gain when one's body is returned to the earth.
I believe that I read that Sweden was allowing some sort of composting funeral option. It was a radical, fringe option, though one would think it would be the norm.
When I got the ashes from my dad, there were chunks in it. This was confusing until I recalled that he had chunks of a hi-temp porcelin crucible in his body from a bad experiment when he was a teenager. They made it through the heat intact.
When my mother was torched, we went to get her ashes, and I asked for the titanium.
(she had hip replacements) The funeral guys got very nervous about the request, and couldn't explain to me where the titanium went. They were $10,000 parts. Gone.