Hey everyone. I live in the cold temperate northeast U.S., and a big thing lately in this area is season extension using agricultural fabrics and mini-greenhouse row covers. This is becoming a crucial way of feeding ourselves year round, but a very depressing thought just dawned on me. These fabrics and plastics are made of petroleum. Also, they take a really long time to break down, releasing toxins in the process. Does anyone know of any non-petroleum based greenhouse plastics and agricultural fabrics, or possibly an alternative to these two. One obvious one that is abundant, although not renewable, is glass. However, this is very bulky and easily breakable. Other than that, I'm stumped. Any suggestions?