Your premise is faulty and following through on it could doom the poor of the world to continued poverty.

First world consumption isn't something that's done at the expense of the 3rd world, it's something that sends money and skilled jobs to the developing world to help them bootstrap their way to wealth. Look at china, south korea, taiwan, etc. these countries have climbed out of 3rd world poverty by being "exploited" by the 1st world and have become developed and increasingly affluent. South Korea, for example, is rapidly becoming a 1st world nation. Would that more countries followed those examples.