New species are added to a known tree. The record is not re-written regularly. There is not a hole for Aliens, or indeed, even a totally new type of species to exist. We all have common ancestors.
There are not new proposals for our origins, additional concepts such as Panspermia have been postulated, but do not support any Aliens Hypothesis, nor the AA nonsense. They offer an alternative ideal for that initial spark. Genetic manipulation offers a recognisable leap, as we have noted with our own efforts to alter things like Plants - notably corn. Such does not exist in he fossil record, and with what we have, there is no room nor need for such a hypothetical leap that is imagined "might have happened". What is wrong with what we know? Why make stuff up and hope it might be true?
When was that? The Early 40's. What does that have to do with the long history of UFO's? UFO reports predate this. And there is no specific interest in military sites. They get visited as often as a farmer is, probably less if I look closely at the statistics. So we saw UFO's long before, and after the Atomic tests and usage, but they are related? How so?
Agreed, Australia is seriously considering throwing ou the model of a "Big Australia" and staying near our curent population count to maintain a certain level of lifestyle. What on earth does our economics have to do with Aliens?
Indeed, and we are trying to fix things before they all break. As I said, Solar, Wind, Hydro, Geo, Helium, all of them are on the books, and have been for decades. Again, what has that to do with Aliens?