I think when one dies, they return their debt to the ecosystem of earth in the form of the ecosystem itself (i.e. in the form of usable chemicals and molecules like carbon for plants to build with). That would be my physical death. Spiritually, I will pass my soul on to Mother Earth and She will do with it what She wants. I believe that my soul, although tatered from being a human, will fuel Mother Earth to continue on. In a sense, I will be eternal because what was me will always be, whether it is me or not. I prefer to be a wildflower or tree somewhere in a virgin old-growth (or late successional) forest in the southwest United States (my place of SPIRITUAL birth). My carbon will not be wasted.