Clark Wang is a psychiatrist who, like most of us, didn't think much about death. When he did, he always figured he'd be buried next to his mother in Michigan. Then Clark found out he might be dying. Now he's become an advocate for a growing movement in the United States called green or natural burial. Instead of an expensive metal casket sealed in a vault to keep hazardous fluids from leaching into the ground - or cremation which spews contaminated dust residue into the air, Clark is opting for a biodegradable coffin made from salvaged wood. He'll be buried in a natural wooded area newly set aside as a memorial garden by a traditional cemetery. Also: a reluctant landlord. And, running barefoot.