You're basically presenting a false dilemma in which the only options compatible with non-urban living are a high-impact car culture vs. abject poverty with almost no modern technology at all. There's a lot of space available in between those extremes. It all just seems unthinkably exotic to many of us in the "first world" because our societies for the most part no longer *allow* us any of those other options.
@chrisblake Yes, in any poor communities there'll be unrepresentative exceptions, a minority lucky enough to escape their circumstances and do well despite the odds. That isn't an argument in favour of the environment.
Which central American and south Asian countries are we talking about specifically?