Even if the first world completely abandoned its own self interest and made improving living standards in underdeveloped countries the primary and overriding goal, that is best achieved by deploying the resources and technology we have at our disposal to come up with intelligent solutions to their problems, rather than just dropping a bunch of money into Africa via helicopter and calling it a day. Resource depletion and environmental destruction are serious concerns of course, but the reality is that we already made a mess of things and the damage won't be reversed if we just drop what we're doing and pray for everything to go back to the way it was. Science and technology may be part of the reason we screwed up the planet so badly up to this point, but they're also the only path we can take if we ever hope to set things right once again.