We haven't figured out how to reliably protect Earth from a large asteroid impact.
open
Global / Unspecified, Global
We can now detect many dangerous asteroids years in advance, but we still lack a proven way to redirect or destroy one heading for Earth. One unlucky strike could cause damage on a civilization-ending scale.
Citation ID: WS00013
Title: We haven't figured out how to reliably protect Earth from a large asteroid impact.
URL: https://www.worldsolve.org/index.php?api=problem&id=13