That's an excellent question, one I think I could spend a lot of time answering.
You know, it may sound trite, but it's things like respecting basic human rights. I mean, the allegations, the credible allegations, that have been investigated by reputable organizations regarding the operations of Canadian companies overseas include such things as forcibly relocating people from their traditional areas, causing them serious bodily harm, gang-raping them, killing them.
So as a start, I would say refrain from participating in or allowing the people who you hire or contract to become involved in those kinds of serious human rights abuses. That's a simplistic answer, but that, it seems to me, would be a good starting point.