There is a “new” method described in some articles right now. There is really nothing new with it, at all. It is very similar to traditional burial. The only real difference is that they speed things up, in time. This method is not taking Natures first choice  into consideration, where humus is produced, in an aerobic and life-supporting way. The carbon in the body is not going to support new life, it is going to produce Methane in the rotting anaerobic process and it is not going to be any living soil as an end result. The project is lacking the important biological understanding and knowledge that we have to involve, to get a really good environmentally sound result.

http://www.cbc.ca/news/technology/composting-the-dead-the-greenest-goodbye-1.2873402