Slightly Off FCL
Another must read is NPA 2008-15 "Essential Requirements for Civil Aviation Enviromental Protection"
I'm not great at understanding a lot of these NPA's but this (for them) is a fairly short document. I'm still in the process of trying to understand the implications but I feel, and hope I'm wrong, that it contains significant cost and legislation aspects for all aviation.
It might already be being discussed within GA?
Mike Echo