People in poor countries aren't spending much time thinking about the environment, they are worried about day to day. Most people in the west spend more for their lunch at McDonalds than the poor countries have to feed their families on, and that isn't just Man, Wife, and Kids, often other relatives also living off that one persons pay.

They pay monthly salary and theres no OT, no second job, and getting one job is quite a task. Some local food might be cheaper, but most food sells at global prices and if its cheaper then the quality is lower.