re: Dennis Wingo - Why Space?
"Responsibility is preventing an impact from ruining the planet we live on."
I agree and that this is example of responsibility. And there are people around the world involved in this, but perhaps all govts around the world should be more involved with doing something about it.
It is not responsible to have some excuse of "allowing nature to take it's course" or saying it's the will of Allah or something.
The environmental impact from an impactor could dwarf and in the past has dwarfed all of the environmental impact from all human activity. So if one considers oneself a environmentalists, one should [if one was rational] also be concerned about preventing impactors from hitting earth.