I have a friend who used to work for the Red Cross and is now a freelancer... she works in the field of economic sustainability (
www.deborahdoane.com).
She did her masters at the London School of Economics. That's my connection to that world.
The key, if you don't know exatly what you want to do, is to network with the organizations that dlishsguy listed. Call them up and set up an interview with the local president or human resources and find out what sort of jobs they have available. Find out what qualifications are required then go get those qualifications.