Why have Only Humans.....

[Insp. Clue!So?]

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There isn't a really good reason for a high level intelligence. It really isn't as useful for survival as you might think. We are sort of a fluke. I've read that a lot of biologists believe that if you went backwards 40 million years and ran the whole thing over and over again there is a very good chance we wouldn't even show up. Brains require a lot of energy to keep going and aren't as useful to most species as they are to us.

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I think this is just almost incomprehensibly wrong. Science, our latest, best way of understanding nature and our environment and a direct result of our intelligence, is realistically just a few hundred years old. We are practically a new species with its invention. We are the first to even recoginze that there are consequences to specific actions we take, and the first to be able to change those actions or mitigate the damage mid-stream. For a large, high-maintenance creature we are wildly successful. We will be very, very hard to kill, and should we live a few more centuries and enjoy technical progress even remotely similar to that enjoyed these last few, most of what some view as intractable problems today will vanish. If not sooner.

Talk about your poverty of imagination...