I've done work with both the RMEF and DU over the last 20 years or so... it's a lot more than just wanting to do something to help.. You need money to purchase habitat to keep it from being bulldozed and that takes organization and specialized skills. But if you're serious I would suggest contacting any of the above organizations and volunteering your time and money there. I can't speak from personal experience about the WWF but I know that both DU and the RMEF are very dedicated to conservation and habitat preservation.
I'm not afraid of the Dark, I'm afraid of what's IN the Dark. ~Anonymous~
Ball Python, Leopard Geckos, Bearded Dragon, Crested Geckos, Corn snakes a Dumeril's Boa and African Dwarf Frogs so far.