Tides will change, ocean and wind currents will change, temperature likely as well, plus the energy coming into Earth will change concentrations; full moons cause more 'Werewolf' like behaviour...
about as soon as we have to worry about something hitting the earth.. not for a very long time indeed.
Someone could always shoot something up there; moon landing or moon base / experiments could have disaster, or maybe someone will want to start selling large chunks of the moon and start dynamiting.....
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