http://www.technologyreview.com/energy/38114/?p1=A4 Are you worried about peak-oil theory? Killing the environment with your petro-surfboards? Well the future is here now! (Maybe) Bio-based plastics. Polyethylene from sugarcane.
Entropy Resins are made with Pine Oil and Vegetable Oil. Thay have been successfully applied to surfboards. http://www.entropyresins.com/