I have never heard of the distinction between "environmentalist" and "conservationist" before, so at least it is not really used where I live. But it makes sense, and I suppose it is good to have different words, since these groups will have very different goals.

Focusing on tying the economy to environmental sustainability just seems to be the only viable long term in any circumstance.

I completely agree. I can't really blame any poor countries for making bad decisions, because it's not like they really have a choice, because they do need some income to run their country.