exactly!!
thinking that forests would be a waste of space and graves would not is just stupid. no one's gonna remember anyone after a century, but the tree will remain, and keep doing what it does.
although i wouldnt want your body fed to an animal, that doesnt seem right. even a dead pet shouldnt be fed :/
room is being used up by useless graves as it is. and trees arent always huge, they become huge after a very long long time.
but in that case why not cut down all the trees in the world? forests are desperately needed, and this sounds like a way as good as any to make some in the upcoming years.