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RE: What If There Was Another Intelligent Species Before Humans?
Some thoughts.
Life has been present on earth for several billion years.
It's bee almost completely wiped out several times.
Man has only been present for about ONE million years.
Our civilization has only been significant for about two hundred years.
Carbon Dioxide is bogus.
Yeah, I have read about the Silurian Hypothesis and it's an interesting one for sure.