Everybody is always posting about cool Web sites, but this one I found actually meets the definition.
It's called "longbets.org" and it's a place where you can go make a prediction that is a minimum of two years away from being proven or disproven, and can then accept bets on whether you will be right or not.
Here's how it works:
One person has made the following prediction:
"By 2030, commercial passengers will routinely fly on pilotless planes."
If you think he's wrong, you can attempt to get him to bet (minimum of $200) against you.
Here's another prediction:
"By 2020, bioterror or bioerror will lead to one million casualties in a single event."
"By the year 2020, the tickets to space travel - at the least to Moon, will be available over the counter."
So, my question to you is this: All betting aside, what is your long-term prediction for the future of the planet (or just right here at home)?