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Styrofoam is a wonderful insulator,
. . . but, is:
. . . . . . non-biodegradable,
. . . . . . releases toxic fumes when burned, and takes
. . . . . . 500 years to breakdown.

Polyvinyl alcohol, bonds with nanocellulose crystals, derived from wood pulp,
. . . makes the resultant foams more elastic, and makes it a good insulator.
. . . It is light yet can support up to 200 times its own weight without changing shape.
. . . It degrades well, and burning it doesn’t produce toxic ash.

5-14-2019 Source:  An Environmentally Friendly Alternative To Styrofoam