Are They Biodegradable? 

An Australian cemetery is going to bury people vertically:

An Australian company has been given approval to begin work on a cemetery where bodies will be buried vertically to save space and minimize impact on the environment, a spokesman said Thursday.

Tony Dupleix, director of Palacom, the company given permission for the cemetery, said the plan would involve no-frills burials, using a simple body bag rather than a casket.

"When you die, you are returned to the earth with a minimum of fuss and with no paraphernalia that would affect the environment," he said.
...
Anna Jamieson, of the Darlington Cemetery Trust which will manage the cemetery, said the plots would be ideal for environmentally minded people, but conceded it was unlikely to replace the time-honored horizontal interments.

I have a feeling not too many environmentalists would be happy to be buried in a plastic bag that was made from petroleum products and won't decompose for a few thousand years... call me crazy. Maybe it's time to rethink your plan.

As for me, I want to be buried face down... so the world can kiss my ass when I'm dead. Or if you prefer, so my ass could be grass. There are just too many puns there.