GEKs go to work for many different types of companies. Jobs for the GEK include making use of waste feed stocks on the farm (agricultural residue), wood working operations (saw mills, wood shop lathings, slash), green advocacy groups and programs (demos and education), zoos and animal husbandry (animal waste combined with bedding material), research companies (providing wood gas or development platform), energy consulting companies (demos, pilot plants, development), etc.