Robert wright interviews a number of thinkers who grapple with the telic implications of the anthropic principle. A brief video clip of a particularly interesting session with physicist turned theologian John Polkinghorne is here, and links to interviews with Freeman Dyson, Owen Gingrich, and Brian Swimme can be found there as well. Swimme, by the way, does a pretty good job of convincing the listener that the universe must have been designed while trying vigorously to avoid that conclusion himself.
It seems to many that our universe is so astonishingly fine-tuned for life that either it is the product of purposeful design or there must exist a near infinite number of other universes in addition to our own. If there are enough worlds, the thinking goes, then every possible world, no matter how improbable, would have to exist among them. Since ours is a possible world it would have to exist, and therefore we shouldn't be too surprised that it does.
A lot of thinkers, including many who don't want to accept the conclusion that our world is intentionally designed, are very uncomfortable with the many-worlds hypothesis. They don't like the fact that there is no evidence for other worlds, and it's hard to imagine how there could be or how any test for another universe could be conducted. They're also uncomfortable with the obvious flouting of the principle that the most parsimonious explanations which fit all the facts are to be preferred in both science and philosophy. There's nothing parsimonious about an explanation which posits a near infinite number of entities that no one has, or could, observe. Moreover, the source of these other worlds seems problematic. How are they being produced? Is there some sort of universe generator that manufactures universes? If so, what sorts of laws would govern it? Where did it come from?
Finally, we might ask of the advocates of the many-worlds hypothesis why it is, given that we have evidence of minds producing order, complexity and fine-tuning but no evidence of other worlds existing, that they would embrace the speculation that they do. If this embrace is merely an act of desperation to enable them to escape the inference that there is a cosmic designer then why do they feel the need to do that? Why is the existence of a cosmic designer more philosophically repugnant to them than the existence of an infinite number of worlds?
