Earlier quoted context omitted.
Burying in a coffin requires wood and precious land space. What else do you propose? Burial at sea? A boat that would take your body there would also burn oil. I mean, there's a million more wasteful things that you can complain about, other than how we dispose of our bodies after death.
Why not just liquify bodies with chemicals and then flush them down the drain?
I for one don't want to drink liquefied brains.