Another few thousand years now, is it? *sigh*
I am suspicious of the Clovis interpretation, as I don't think that the early inhabitants could have entered the Western Hemisphere and then diffuse across so many ecosystems so quickly. How does one transition from, say, the Pacific Northwest with rain forests, to the semi-arid California coast, to the deserts of Mexico, to the rainforests of the Central American mountains, to the Andes, and on to Tierra del Fuego.
The survival skills which I would need for one environment would not be very useful somewhere else. Certainly, those people were pretty bright and "in tune" with the environment so that they could survive, and presuambly prosper, in harsh surroundings, but I just don't see how they can populate the Western Hemisphere as quickly as the Clovis model demands.
I admit that I don't know where pre-Clovis people would have come from. There apparently isn't much evidence of humans in east Siberia prior to about 18000 BC (or is that 18000 years ago), although I wonder how thoroughly the fossil record in Siberia is known.
Please ping me, if any further info comes up. Thanks.