The last couple years Discovery Channel and it's networks seem obsessed with doomsday theories. They've had specials on everything on everything you can imagine: supervolcanos, asteroids, polar shifts, implosion of the sun, etc. We know that all of these have happened before. That's a given. The human population hit a bottleneck and reduced to just a couple thousand people twice that we know of about 140000 and 60000 years ago. The first one was most likely an asteroid and the second was probably the Toba supervolcano eruption. We know this based on mitochondrial DNA and Y chromosome testing (BTW: we're all inbred) I just saw a Science Channel special on asteriod impacts. It discussed ways that NASA is working to prevent/predict this. My question for you is: If this has happened before and humans still got to the point that they are what gives us a right to fight nature's plan? I mean eventually the sun will collapse and every human not in another solar system is going to disappear in seconds anyway. It's a different matter if it's mutually assured or otherwise man-made but why fight nature when it was already so right in the first place? Discuss