Hydro does not have to involve putting in a...

Hydro does not have to involve putting in a dam.

http://verdantpower.com/

In channel is also hydro power.

off-shore wind is very good (on-shore has created some backlash from an aesthetic point of view.

I dont think I am a 'greenie', i just want to protect the environment. I think finding the best energy sources that minimise environmental impact and are economical is the intelligent approach. Does that make me a 'greenie' or a concerned citizen about species survival? If that makes me a greenie is there something wrong with that?

Why bash the 'greenies' that want to protect the environment for your benefit also. I may suggest you explore the term "ecosystem services". It is important stuff!