How Do We Dodge the Next Incoming Asteroid?

Social networking has never before made me feel quite so vulnerable to space rocks!
A few days ago on Feb. 9th, I received a tweet advising me that asteroid 2011 CA7 had just shot between the Earth and moon at a distance of only 0.3 lunar distances -- or 115,300km! That was close, but the car-sized asteroid flew harmlessly by and it was time to breathe easy.
Most of humanity was blissfully unaware of this close encounter but as someone who was in the know, I found myself wondering if it's better to know about these events or to remain in contented ignorance of pending destruction and near misses.

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How Do We Dodge the Next Incoming Asteroid?