Sahara: The Life of the Great DesertA glittering geographic tour of the remarkable history, peoples, climate, creatures, sights and sounds of the largest and most austere desert on earth. Ten thousand years ago, the Sahara was a temperate grassland petrified trees mark where forests used to stand, and former riverbeds are rich in the petrified bones of hippos, elephants, zebras and gazelles. Then a slight shift in the earths axis transformed it into the greatest desert in the world with