About 2.5 million people die every year in the U.S. alone. Disposing of human remains creates a serious ecological challenge. Traditional burials involve treating a body with formaldehyde and other chemicals then burying it in a wooden casket where it takes years to decompose. Cremation burns a lot of fossil fuel.
One possible alternative: a process is called promession, invented Swedish biologist Susanne Wiigh-Mäsak.
Mother Nature Network explains:
The breakthrough process takes only about six to 12 months to transform a dead body into high-nutrient compost. Here’s how it works: A corpse is first frozen to -18°C (0°F) and then submerged in liquid nitrogen. Then the frozen, brittle corpse is gently bombarded with sound waves, which break it down into a fine white powder. That powder is then sent through a vacuum chamber that evaporates all the water.
Since water makes up about 70 percent of an adult human body, the mass of the powdery corpse becomes greatly decreased. Also, if the powder is kept dry, it will not decompose. This erases the need for a speedy burial or funeral service, and it preserves the corpse without the need for any unnatural chemicals like embalming fluids.
When it does come time for a burial, the powder can then be placed in a box of biodegradable material like corn starch and buried in a shallow grave. The mixture will create nutritious, fertile soil, perfect for planting a tree, bush or garden, depending on the desires of the next of kin.