Indeed, life on earth is about half over. It has been around for about two billion years and from our knowlege of the changes that occur in stars, the sun will become a “red giant” destroying the the earth and other planets in another two billion years or so. Richard Lewontin in The New York Review of Books
So now you know how it’s going to turn out.
(addition at 9:30 am):
This explains in part the appeal of the notion of the rapture: who wants to think that they have entered in the middle of a movie which the are going to be whisked out of after viewing a couple of its frames? How much more comforting to believe that you’ve shown up just in time for the climax, with an important, albeit supporting role to play.