Spray foam is good. Among other things the U.S. Green Building Council considers a product green if it improves energy efficiency and is sustainable. Spray foam seals a structure in a very efficient manner. It will not break down over time, keeping an air tight seal. This allows for much less energy to be used when heating and cooling a building. Most foam is produced with approximately half of a petroleum based substance. There are companies like BioBased (linked below) that are manufacturing foam with less petroleum in their products.
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