I know this wasn't directed at me, but I will answer it. The Flood caused the so-called ice-age. The poles froze quickly and the ice caps were enormous. When the non-frozen floodwaters were newly receded because the ocean basins had collapsed, all of the continental shelves were above sea level. For a time, the continents were not isolated from each other and anybody, (people, animals, birds, et al) were able to migrate to any continent by walking. As the polar caps melted off, the continents became isolated from each other, different synergistic ecosystems developed, and organisms adapted to their respective environments. So for the last 4400 years, we haven't experienced "global warming". It's been "global thawing".