Krugman thinks it would be good if we had an alien invasion bubble to help get us out of the recession.
He's always good for the lolz.
http://www.youtube.com/watch?v=zFEmlgfEGYo&feature=player_embedded
My favorite economist ever
Actually, this idea of an 'alien invasion' as on that could unite humanity was one I had as a child; I was surprised to learn Reagan had said the same thing.
Rachel Maddow did a nice piece with clips from both:
http://www.msnbc.msn.com/id/26315908/
More recently, I was considering a similar issue looking at ancient history as the few humans on the planet in the days of ancient Greece spent society's resources on war.
How much better could mankind have advanced if the human race had been more cooperative and less warlike?
But even when faced with nuclear annihilation, mankind took hugely unnecessary risks and let the danger get far higher than needed, and got lucky (so far).
We had people at the senior military level favoring starting nuclear war.
I've come to the view that groups of people always tend to break into these competing groups. If the most fundamentalist sect in the US took total global power tomorrow, it'd be no time before they found something over which to break into fighting groups over which was the only 'real' best group. Perhaps the split of the Muslim world with Sunnis and Shiite fits this, as does stages with divides like Catholics versus Protestants and other such divides.
This is where a leader like a JFK who realized the need to say 'back off, we need to remember we and the USSR are all human beings' contrasts with this tendency.
It helps explain why I'll see small villages filled with purported "progressives" often fragment into fiercely bickering factions. Did they forget their values? Some do.
I have to give credit to Reagan for making the point where did - like the United Nations. Not many presidents could have done that without massive ridicule.
Reagan actually had great political capital for peace, mostly squandered, because 'everyone was so worried he was a war nut' he could get away with peace initiatives.
I actually have a small collections for 'are you a progressive or conservative', and the first on the list is 'do you think you are a member of the human race first and your nation second, or as a member of your nation first and a member of the human race second?' I think the answer largely divides the groups.
So progressives will often consider issues from the view of 'the human race', while people on the right are more willing to consider the needs more of 'their group'.