A very good insight delivered Slate Magazine with an excellent article.
Some quotes I really liked while consistent with my own observations:
WA says on its website that it works with villagers who "once were forced to roam the forest as hunters and loggers, diminishing Cambodia's environmental heritage, [and who] now have legal jobs as guides and operators of sustainable trekking, mountain-biking, and river boat tours."..."The wholesale destruction of Cambodia's environment is an important issue, but hunting and poaching by people eking out an existence in the forest isn't the problem," says a Western expatriate with extensive experience in land issues. "The primary causes are the government issuing massive land concessions to developers and wide-scale logging."
"The NGOs desperately want access and the basic equation is that the government grants it to them in exchange for their silence about corruption or anything else remotely controversial,"