Then I thought there are other green, organic or self-sufficiency related programmes, like It's Not Easy Being Green, some news reports from main channels on green issues, relevent documentaries and wondered if there is enough material. Then I wondered how it could be paid for. If it didn't get public service broadcasting status and put on BBC it would have to be supported by advertising.

It'll never work. I can't imagine which companies would be willing to advertise to to people like us, mostly determined NOT to spend money!
But could it work? What about a couple of hours in the middle of the night on an obscure freeview channel? A few adverts from solar cell, wind or micro hydro producers, water treatment, organic seed, animal feed merchants...
I'd watch (or rather record it for later); would you? Are there enough people like us for it to make it work?
More ideas?
(Yes, I know about selfsufficient.tv but I'm still on dial-up.)