Asteroid Warning System

here is a simple practical solution to the asteroid problem

early warning system

devote internationally perhaps a billion dollars a year to predicting asteroid impact
and just give people the heads up!
six months warning would be great


EVACUATE!
evacuate Madrid or Sydney or Los Angeles

and update the prediction every day!

this could save a lot of lives and yet not cost a lot
maybe a billion is way off
maybe ten million per year would be enough!
It would not save the buildings
but it might save the people/