Alosa, your comments seem more, shall we say, strident as we discuss this. I'm curious why-you seem to have something of a stake in this issue and write as if you know more than most of us. So I'm wondering what your background is? As I said, I approach this from an historian's perspective. I've taught history at a University (UC Davis) for almost 35 years, but also have a minor in paleoanthro, which requires a fair amount of geology in addition to the physical aspects of human evolution. I've been outside all my life, in every ecosystem except the Saharan, thank God. No interest in deserts or jungles whatsoever (but I know the jungles and highlands of Vietnam well enough).