Theory or Fact?

In a post, "Climate facts versus climate theories," at the Watts Up With That? blog, petrophysicist Andy May expresses skepticism about man-made global warming. In his analysis, he compares aspects of the climate change issue to evolution, and states that evolution is a fact.

What exactly is meant by evolution? Evolution can refer to change over time (micro and macro evolution), universal common descent, or the mechanisms by which change occurs. May has the first definition in mind.

Here's...