Interesting. I built a fine signal fire along the Pacific shore in the rain in January in the Olympic National rain forest. Huge chunks of styrofoam were everywhere. Being in the middle of a wilderness area, they must have traveled there from far away. We get radioactive stuff on the beaches of Washington from Japan. I guess I haven't been to a ocean beach that didn't have lots of foam and other trash. Even found an old ammo can with with 30-06 ammo in it on the California coast. It was not usable. The brass and bullets were completely green.