posted on Jan, 18 2009 @ 01:56 AM
I think what the OP was trying to ask, is if an asteroid or comet were to strike the planet, that was of a size that was surviveable, what challenges
would you face to live through it.
From what I know about this, any hit that was big enough to cause major catastrophy for humans, would likely change the global climate of our planet.
Debris from the impact would be ejected into the atmosphere, possibly the stratosphere depending on it's size.
The first problem to arise would be the burning material falling from the skies from the impact. This would set fires across the globe, adding more
carbon dioxide to the atmosphere. Any living things caught out in the firestorm would most likely die.
Second problem to arise would be the blocked atmosphere, choking out the sunlight that warms our planet. As a result of this, you'd see the temp
begin to drop across the planet. We would be plunged into an Ice Age, as the temps dropped with no sunlight to warm things up.
Likely, the only habitable places on the planet would be around the equator, as this would be the only place to be close to any warmth that may still
be coming through from the sun.
So, my answer to how to survive this scenerio is pretty straight forward, for what it's worth: Head for the equator, and dress for the cold.
[edit on 18-1-2009 by treemanx]