I think you are right. But, I'm not sure.
Perhaps it's better to look at "destroying our planet" (or whatever) as a byproduct? Like you said, we didn't decide this in Africa, it's just a result of our drive to advance our way of life. But, now preserving our environment and adopting more sustainable practices is the next frontier in advancing our way of life.
Also, isn't the basic animal instinct to survive? Scientists claim with the 2C threshold (I think this covers it slightly, http://news.bbc.co.uk/2/hi/science/nature/8023072.stm) that we are at a time where without change, we may not survive (in large numbers at least, and in some years)? Maybe the instinct doesn't act on a tribal or global scale, but only personal. Like when a tiger is coming after you.
And, of course, I don't expect everyone to grow their own food. But, there are people who love farming, and if we help these young people get into it, they can provide on a smaller scale, within each community.
I suppose my point is, sure humans have the instinct to advance their way of life, but that does not necessarily go against producing ones own food, or living a quieter and simpler life.