David Icke's Resaerch On Early Earth?

I recently downloaded a lot of David Icke books and I'm currently in the beginnings of The Biggest Secret. All I can say is "WOW." Icke certainly does offer many interesting and startling alternative views to history. Now whenever Icke's name comes up it seems as though people always jump onto his Reptilian theories and begin an entire conversation about whether he's a nut or not, but with this thread I would much rather see what people have to say about his early Earth theories. Such as Earth at one time being closer to the Sun while Mars was in its place, or the evidence for ancient advanced civilizations, and the catastrophe which may have been the inspiration for the "Great Flood" mentioned in the Bible.

I'd just like to know what other ATS posters think about such things.