Honestly, I am sure that cremation is much better than burying a decaying body. I am sure that this is also a concern for the soul. Cremation releases the soul faster. It will no longer be tied to the decomposing body and the process of its ascent will be faster.
We're the first to say each to their own. But cremation wastes a lot of energy and is polluting. Is that the parting eco-statement you really want to make? The "ashes" are really just ground-up bone fragments. I'd rather transition into rose bushes or a tree, maybe a dogwood or Giant Sequoia.
I always thought the green burials consisted of a cremation first and then using the ashes to help fertilize the small tree. Is this not the case? They just put the whole body in the ground?