"Whether the ice caps melt, or expand - whatever happens - the anthropogenic global warming theorists claim it confirms their theory. A perfect example of a pseudo-science like astrology"

This quote by Frank Tipler is a criticism of the theory of anthropogenic international warming. He is indicating that the theory is a pseudo-science, like astrology, due to the fact that it is not based upon scientific evidence. He is stating that no matter what occurs with the ice caps, whether they melt or expand, the theorists will declare it validates their theory. This is an example of verification bias, where people only search for proof that validates their beliefs, and neglect evidence that opposes them. Tipler is suggesting that the theory of anthropogenic global warming is not based upon clinical evidence, and is rather a type of pseudo-science.