Hi Sarah,
What you want to do is very important, and I hope that you get to achieve this.
I understand what you and Astar mean about trust worthy charities but IMO you can be assured that the majority of them are registered and are trying to make a difference. However, many of them do spend a lot of the money raised to cover the administration costs, and these are the ones I tend to have most trouble with.
Nevertheless, the big charities like Action Aid are very good, but smaller ones also play a vital role so check out all the options. Also, have a good look around on the net, there is a host of info available on this. There are plenty of opportunities to do conservation work in the Phillipines and Indonesia, but I get the impression you really want to be involved in human relief. Maybe you should look into what's involved in joining 'Medecins Sans Frontiers', who really are the front line in relief for the hungry and ill.
Good luck
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