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When Sagan was around, he made a good argument for life in other places based only on the vast numbers of stars in the universe. But I don't think any planets had actually been proven before he died.
We now know that our circumstances aren't unusual at all. Based on observations we already have, it seems likely that there are billions of planets very comparable to earth in terms of side, distance from their star, and the existence of water. We may not be able to prove the existence of life until we shoot down a space ship or two, but it is getting harder and harder to believe that Earth is the only place that could evolve life.
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