Time Travel, Einstien theorizes that it is possible, many scientist agree.
Ghosts, 99% of parapsycologists agree that ghosts are real!
Aliens, Thousands of scientists believe aliens are real, some even believe that they have already been abducted and probed by aliens.
Climate Change, many Climatologists theorized that the Global Average Temperatures would continue rising out of control melting the polar caps by 2014. "Unfortunatly", the last 5 years, the average earth temp has leveled and even slightly decreased. So, now climatologists theorize that instead of "Global Warming" we will experience extreme changes in climate, like massive hurricanes hitting the eastern coast of the U.S., or F4 tornados creating large paths of destruction across the Mid-West, or exessive amounts of rain causing mudslides along the Pacific states. The problem is, Meteorologists (weathermen) can show all of these events occurring multiple times over the last 200 years, and the most extreme occurraces have not been in recent years.
I am open to evidence showing any of these "Sciences' to be more than theory, but just as I would not want my President preparing for an alien invasion based on the limited science available, I also do not want to prepare needlessly for "Global Warming"/"Climate Change".