You know there would be those claiming there is no such thing as a Alien Invasion and we should welcome their alien culture of peace, love and destruction of all other life in the universe
Except we wouldn't unite, and the aliens would just stomp us. I don't think the world is capable of effectively uniting, even under the most dire of circumstances.
The world would unite... Billionaires would make a great sacrifice by building up the arms industry, and the common man/woman would struggle to survive, letting go of his/her creature comforts to defend family, friends and otherwise soon-to-be-green-go comrades in arms.
The outcome would still probably be utter annihilation, but we would be united. :P
Any race of beings capable of traversing the stars would probably just treat us like vermin similar to the way we deal with rats. There would be no method we could come up with that would stop them from eradicating us with impunity. It's kinda like that ant hill in your yard. You don't really pay any attention to it until it annoys you and you get poison that wipes it out or use some other creative measure to to destroy it. We have no real fear that the ants are going to attack back because they're ants. They are so far beneath us that their destruction is something we will do then just forget about the next day.
shit if they have the technology to travel far enough across space to find other intelligent life they'd probably have the technology to fuck us up with ease as well
We must be the laziest generation, we are all about the apocalypse .. Ugh, the world is to messed up and I don't have the energy to fix it. . I wish something would just destroy it so we could start over...
Personally, I work for a non profit and I am engaged in local government. I'm about improving what we have... but look at all the apocalypse books, movies and tv shows. It's like blow it all up, cuz student loans are a drag.
The outcome would still probably be utter annihilation, but we would be united. :P