@Shinhyung,
Why should we destroy the earth if it will likely outlast us all?
Technology makes it possible to do such things, and technology will eventually become our undoing. Knowledge is the deadliest weapon of all, and once technology surpasses us in knowledge, we won't be needed anymore. Figuratively or literally, humanity is coming to an end. Either we give up our humanity to technology or technology destroys us.
If that doesn't happen, doomsday conspirators can just worry about our race for the rest of eternity.
---------- Post added 09-30-2009 at 06:45 PM ----------
We could also condemn the world's 50 million most unhappy people to New Jersey.
But seriously, consistently unhappy people have no reason to be unhappy other than to make happy people unhappy as well.