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Originally Posted by whswhs
I don't think "rare" is meaningful. There is only one known life giving planet, and it has human-level intelligence.
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This is a sample counting issue. Equally you could say it's been life giving for about 10,000 times as long as it has had intelligence, so the odds are about 0.01%
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It will have to be really close observation, though. Suppose you observed Earth, say, a quarter millennium ago. What signs of intelligence could you spot from a modest interplanetary distance, let along from parsecs away?
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From a modest interplanetary distance you might be able to see evidence for agriculture, some serious scientists thought it might be possible to see on Mars. Though the fact there are only handful of actual Martian features that seem to correlate with those maps of Mars at all suggest actual resolution wasn't anywhere close to what they *thought* it was.