How big would an asteroid have to be to cause major damage to earth?

Question: How big would an asteroid have to be to cause major damage to earth?
- Keywords:
  earth,
  space,
  universe
Asked by lovebomb to Joe, Juan, Kate, Rory, Rosie on 11 Mar 2014.
- Kate Salmon answered on 11 Mar 2014:
  
  Hi @lovebomb- I’m not entirely sure exactly how big it would have to be but I don’t think it would have to be very big. They say that an asteroid a mile wide would obliterate all life on earth! Most small meteors burn up in the atmosphere and this causes shooting stars.

lovebomb commented on 12 Mar 2014:

It is amazing that a 1 mile wide asteroid could destroy all life on earth!

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Question: How big would an asteroid have to be to cause major damage to earth?