Did you read the links I posted? They can be made from dandelions. More info can be found in this previous thread:

https://news.ycombinator.com/item?id=37727040

Personally I would love to see a world of 100% transit, bicycles, walking, etc., but let’s be realistic. As long as we’ve got cars, we might as well try to do as much as we can to reduce the amount of pollution they generate.

In previous thread, I made same comment and got same response. So maybe time to stop worrying about forests and look into my memory.