"A modern natural burial is an environmentally sustainable alternative to existing funeral practices where the body is returned to the earth to decompose naturally and be recycled into new life." This interesting site compares conventional funerals and natural burial options.
Here is just one excerpt from the extensive Media Archive: "Nearly a million gallons of embalming fluid is buried across North America each year...exposure to formaldehyde has led to a higher incidence of leukemia and cancers of the brain and colon among funeral directors."