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It is very very hard to detect things in space, especially small objects like this. I don't know if the James Webb telescope going up in 2020 will be used to look for things like this, but it does have the infrared parts (couldn't think of a better word) to detect things like this. Right now by the time we did find something that would destroy the earth it would be to late to do anything about it.
I understand its extremely hard to detect them but it seems like there is no real initiative from our world to at least make advances in detecting them.
For something that we know for a fact will hit at some point and could even lead to the extinction of humans, you would think there would be some more effort.