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This answer to Does NASA have an end-of-the-world policy? mentions the National Near Earth Object Preparedness Strategy and Action Plan.

Has this plan resulted in any action?

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  • $\begingroup$ "When in trouble, when in doubt: run in circles, scream and shout." Which is to say, there's always the the evaluation matrix of "level of probability" vs. "seriousness of outcome" ; said matrix to be used to decide how much time&money&resource is worth spending on events with X probability. $\endgroup$ – Carl Witthoft Feb 20 '20 at 13:08
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    $\begingroup$ Appropriate user name for this question... $\endgroup$ – Darrel Hoffman Feb 20 '20 at 16:00
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There's the usual collection of overly dramatic news reports about this branch of NASA finding and tracking near-misses:

express.co.uk reports a tracked object that came within 0.03860 AU. It's not clear when NASA first detected it.

USAToday for a simulation drill that was run in mid-2019,

as a tabletop exercise Monday-Friday at the 2019 Planetary Defense Conference in College Park, Maryland

Closer to reality:

A NASA update briefing with lots of colorful charts. Some examples: enter image description here

enter image description here

enter image description here

So not only are tracking methods and capabilities being upgraded, but long-range planning and design of possible deflector systems continue. Bruce Willis approves.

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    $\begingroup$ @uhoh will attempt to do so once I get rid of my stack of VeryImportantMeetings(TM) $\endgroup$ – Carl Witthoft Feb 20 '20 at 13:23
  • $\begingroup$ excellent, thank you! $\endgroup$ – uhoh Feb 20 '20 at 14:57
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    $\begingroup$ A tabletop exercise is run at each of the biennial Planetary Defense Conferences involving the conference participants; past conferences links are here. NASA and FEMA run joint tabletop exercises roughly every year, reports of previous exercises are at the bottom of the PDCO Supporting Documents page $\endgroup$ – astrosnapper Feb 20 '20 at 16:53

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