From Talk Death:
Green or natural burial is the process of human disposition with the least environmental consequences, while encouraging greater land stewardship. Bodies are not prepared using chemical embalming fluids, are placed in simple shrouds or biodegradable caskets, and concrete vaults are not used, nor are traditional markers (headstones & footstones). In Canada, green burial cemeteries come in three forms: full or conservation, hybrid and green-friendly (our term).