Hi VAsleeper,
You can read a little more about “soy based” foams and other plant derivative polyols used in foam manufacturing in post #2 here and in this article. They are a small step in a good direction IMO.
Select foam is one of the manufacturing members here which means I believe they are among the best quality/value available. Most importantly though … their quality is self evident because they are transparent about the quality of the materials they use.
Phoenix